To set a default define option while allowing it to be overridden from the command line.
`ifndef mode_sel
`define mode_sel …Other articles
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"Verilog: shm waveforms"
The best practice is to use a tcl file:
shm.tcl
read moredatabase -open waves -shm probe -create your_top_level -depth all …"Verilog Timeformat"
Time can be displayed during simulation using
%t.$display("%t", $realtime);Timeformat is used to control the way (
read more%t) this …"SystemVerilog: Constrained Random"
A minimal example of constrained random to constraining a 4 bit value to 0 to 11 when randomised.
read moremodule tb …"Verilog: Thermometer Code"
Efficiently create a thermometer code in verilog:
read morelocalparam M = 32; function [M-1:0] therm_code; input [$clog2(M):0] val; begin …"Find your ruby gems path"
"Verilog: Calculate primes"
"tcsh Remove trailing /"
read more1 2 3 4 5 6 7 8
#!/bin/tcsh set var = "helloworld/" ## http://dbaspot.com/shell/350417-sed-removing-trailing.html set …"Command line bulk file rename"
To prepend to to filenames
cd to_folder ls | xargs -I {} mv {} addthis-{}or target jpgs
read morecd to_folder ls *.jpg | xargs …"List files ignored by git"
"xkill"
I just discovered the
read morexkillcommand, when a window has crashed you can call xkill and get a skull and …"Submit to SGE as if working locally"
Setting an alias in you .tcshrc
alias qrun 'qrsh -V -noshell -cwd !*'or bash
read morealias qrun='qrsh -V -noshell -cwd …"Matlab editor no tabs"
Matlab always use to open text files in tabs in the same editor window. When switching to 2014a documents started …
read more"Simulink: Globally set sample time"
To set each constant in a model to sample time -1:
read moreblks = find_system(dut, 'BlockType', 'Constant'); for i = 1:length …"Simulink: list programmable block properties"
Select a block ie gain in Simulink then in Matlab type:
get(gcbh)This shows the list of properties which …
read more"Matlab: Find all gain blocks"
find_system('BlockType', 'Gain')This will list all gain blocks in currently loaded models. to limit to a particulat model:
read morefind_system …"error: storage class specified for parameter"
error: storage class specified for parameterThere is probably a missing semicolon
read more;in a header file! Just written my first …"Shell redirection"
To redirect stdout and stderr in bash we use:
./ShellFile.sh &> test.logHowever in tcsh that results in:
read moreInvalid …"Floating Point Arithmetic is not Associative"
"Octopress categories with different styles"
As I use the code blocks for ingredient lists on my recipe pages I wanted to have a different style …
read more"Verilog: Timeout"
To wait for a maximum of
10nsfor positive edge on clk then carry on with simulation.read morefork : wait_or_timeout begin …"Matlab Remove Elements from Array"
"Matlab: Formatting Strings"
"Matlab: Grid"
To add X and Y grids to plots :
grid on;
To add Y only grid:
read moreset(gca,'XGrid','off','YGrid …"Matlab: Line Breaks in Strings"
Wrap strings with
sprintfto allow the\nto be escaped correctly.read more>> disp('hello\nworld') hello\nworld >> disp(sprintf('hello …"Matlab: Listing field name values of a struct"
"Matlab toolboxes with absolute path setup"
When a script or function is called with
read morerun(./relative/path/script)the working directory is changed to the./relative …"Matlab: Array content check"
Checking if an Array contains a number:
input = [1,2,3,4]; check = 4; any(input==4)Check if a …
read more"Matlab: Split Odd & Even Array Elements"
Using Matlab to splitting data into odd and even samples.
A for loop approach:
read moredata_odd = []; data_even = []; for i = 1:length …"Licence Types and Short Identifiers"
"Ruby Methods and Splat"
Ruby methods can set default values for optional arguments:
def commit(path=Dir.pwd)To take an optional number of …
read more"Thor Adding --verbose"
With a command line Ruby application using Thor for the option parsing I want to be able to run:
read more$ thor_app …"Creating Lightroom Metadata Views"
Lightroom plugins for metadata views are called metadata tag sets and only require 2 text files.
create a folder called …
read more"Verilog importing envvar"
Based on a Stackoverflow answer, to import environment variables into Verilog you can use:
read moreimport "DPI-C" function string getenv(input …"Matlab: leading 0's"
For adding leading zeros to a number the following can be used for 4 decimal places with integer input:
read moredat …"Matlab Wrapper Scripts"
To wrap a function with variable input arguments and pass them all on to the wrapped function. Based on a …
read more"Ruby iterate over lines in a string"
"Matlab Function Outputs"
Handling functions with extraneous leading outputs. For example:
read morefunction [a,b] = dummy_function a = 10; b = 20; endfunction [a, b] = dummy_function …"$display without a line return"
In Verilog to output to stdout without a line return use
$write();Equivalent statements :
read more$write("\n"); $display("");"rtorrent move on download completion"
rtorrent moving torrents upon completion:
read more# Torrents go in ~/Torrents # Incomplete Downloads in ~/Incomplete # Upon Completion Data is moved to ~/Seeding …"VIM: Convert tabs to spaces"
Good programming practice is to use spaces to indent code rather than tabs. Due to tabs often being rendered differently …
read more"set vs setenv"
setenv allows sub shells to inherit the value.
Set
read moreset x = "twenty" echo $x > twenty ## New Shell csh echo $x …"For loops in csh/tcsh"
"Name Spacing in Matlab"
A typical work flow in Matlab involves a folder filled with scripts and functions. Over time this folder grows until …
read more"tcsh check a var exists"
To check if an environment variable exists in .mycshrc or shell scripts
read moreif ($?TERM) then echo "TERM is $TERM" endif …"Ruby Evaluate Envvars in string."
In ruby Dir.entries takes a path and returns a list of its contents. However it does not deal with …
read more"Terminal Colours"
I have decided to clean up my vim colorschemes. I have been using ir_black for sometime but it does not …
read more"Ruby: optionally add path separator"
I was wanting to use Dir.glob to get a file list and wanted to do
read moreDir.glob( path + '*')but …"Add about page to Octopress"
To add static about page to octopress blog, assuming that octopress has been already setup:
Create the page from the …
read more"Push local folder to remote server over ssh"
After struggling to get the rake task for octopress to deploy I decided to fall back to the command line …
read more"JavaScript Net Curtain"
Normally this would just end up on my link blog, but thought it was worthy of a proper mention.
read more"Ruby duck typing Strings and Arrays"
How to get method which handles a single string input or an array of strings?
Splat *
* turns single strings into …
read more"Print nested array structures in table format"
Problem
Take an array of arrays and format it for displaying to the terminal or outputting to a text file …
read more"Converting flat structure into a nested structure"
Given a flat hierarchy of data comprising level and a label, aim to nest the lower level of objects in …
read more"Git Submodules"
For code reuse within I have found Subversion externals really nice to work with. Instead of copy and pasting code …
read more"Get snipMate working, a #vim plugin"
"OS X Installing R"
"Web Automation with Watir"
"Create And,Or of multiple booleans"
To reduce an array of Booleans to a single Boolean using enumerables reduce method:
read more[true, true, true].reduce( :| ) ## OR => true …"rspec testing exceptions"
"rspec testing exceptions (old post)"
"Ruby special exception variables made mnemonic"
In ruby you can catch StandardErrors using begin rescue end
read morebegin #Some thing which might fails rescue $stderr.puts $! end …"Handle www. and no-www for better google juice"
There was an interesting post on hacker news recently, safeshepherd suddenly fell off the google for their own name. The …
read more"Using Github behind a restrictive firewall"
When working behind a restrictive firewall, which limits ssh connections you may be running into some of the following errors …
read more"Syntax error: Not a valid color stop: Sass::Script::String: white"
After making a few updates to my site it stopped working after deploying. The issue was that the gem version …
read more"Minify your HTML from Sinatra"
There are gzip compression options available but when I looked at this a long time ago I found that the …
read more"Sinatra application in ./lib and views, public routes not working"
I have been setting up my recent Sinatra projects with a standard ruby project layout putting all of the application …
read more"Update your RVM Ruby and migrate gemsets"
Update RVM
$ rvm get headList current versions, and all versions
$ rvm list $ rvm list knownSelect the version you …
read more"Bash script get current script directory"
Sometime a script needs to now the directory that it is executing from, the best solution for this is:
read moreDIR …"Encoding::UndefinedConversionError - "
Are you running into the following error
Encoding::UndefinedConversionError - "\xE2" from ASCII-8BIT to UTF-8:If you are using Ruby and …
read more"User selectable stylesheets (Using Sinatra)"
Working on my site design I thought it would be nice to have user selectable stylesheets, say a black text …
read more"list_temp_files script"
A simple script for finding temp files from the current directory and below. I often run this before adding a …
read more"matrix: A Ruby Standard Library"
Originally written as an assignment for Ruby Mendicant University.
matrix is part of the Ruby Standard Library
Usage
A note …
read more"Ruby get a users real name"
There does not appear to be a nice way to get a current users real name in ruby. The best …
read more"Ruby send message to stderr"
"Suppressing Warnings in Ruby Scripts"
Suppressing warnings is usually a bad idea but if you understand the risk and want to carry on regardless. When …
read more"Setting Ruby Defaults '||' vs 'fetch(){}'"
There is a very good presentation Confident Code by Avdi Grimm author of http://exceptionalruby.com/. Previously presented at Cascadia …
read more"Benchmarking Ruby, explicit vs implicit returns"
Back in 2009 barkingiguana wrote about how explicit returns
read more'return "String"'was slower than an implicit return, ie just letting …"Tagging a git repo and pushing tag to github"
This assumes that
originis the label for github.
Tagging a github repo for my gem releases I do:read more$ git …"Arrays 3, write idiomatic Ruby"
Previous posts arrays and arrays2
Based on a post by barkingiguana, some idiomatic ruby ways to handle arrays. Ruby tries …
read more"Ruby Search and Replace Script."
A small standalone script that search through a file doing text substitutions.
read more1 2 3 4 5 6 7 8 …
"warning: already initialized constant"
Do you some times see:
read moreFileUtils.rb:93: warning: already initialized constant OPT_TABLE FileUtils.rb:1176: warning: already initialized constant …"Ruby Arrays Concatenation and Subtraction"
Building on my original Ruby Arrays article a few more things you can do with Ruby Arrays.
Concatenation
read morea = [1 …"Ruby Blocks for better code reuse"
While working on some disk space / folder structure scripts I had several functions which hierarchically search the disk then performed …
read more"Ruby Basic File Read and Write"
Read text file with one line:
Write text with one line :
Explanation and other ways
When reading a text file …
read more"uninitialized constant Compass::Logger"
Working on a joint project an error started showing up when trying to perform migrations.
read more$ rake db:migrate VERSION=0 …"Ruby script connect to DB using database.yml"
To connect to a rails style DB config outside of the normal workflow, or using a database.yml in a …
read more"Ruby Arrays, Part 1"
"Installing gist.vim"
This vim plugin will allow you to gist directly from vim, simple way is just :Gist to gist entire file …
read more"Obnoxious gem warnings"
recenlty after updating rubygems Istarted getting a lot of warning like this when running ruby or executable gems:
NOTE: Gem …
read more"Recent issue with building Gems"
When running gem build on a new library I have been working on I started getting the following error:
read more[ruby_svg_light …"bash scripts and cron"
I have not fully read it but it looks like this is a good guide to bash scripting. A few …
read more"vimfu end of line character placement"
In Vim to insert text before the cursor press 'i', to insert text after cursor 'a' or to edit at …
read more"Vimfu Reindent"
"Behaviour and State"
Classes are a basic Object Orientated Structure which encapsulate state and behaviour. Some times you just require to capture state …
read more"Better Open Source Project Setup, with RVM & Bundler"
Based on 'Raise the bar, lower the pressure' given by Durran Jordan at ScotRubyConf 2011.
There has been some debate …
read more"Schwartzian Transform"
I recently heard about the Schwartzian transform, which is a sorting idiom from perl. It allows an array of objects …
read more"Reading List"
"Ruby CLI user input using gets"
Using a while true loop with 'gets' and a case statement, can create a compact command line interface for ruby …
read more"ORM(Activerecord) or Ruby Sort"
Based on an old Article I wrote, investigating incase sensitive sorting performance.
I have an active record model call Tag …
read more"gem permissions on WebFaction"
After making a few updates to my site I decided to upgrade the version of sinatra I was using in …
read more"Sinatra regex routes"
The routes for my site have been growing since adding pagination (/articles/older/) and tag filtering. As well as the …
read more"Ruby Block Selection in Vim (Plugin)"
A new very cool plugin for Rubyists using Vim. RubyBlock TextObjects created by Drew Neil from Vimcasts.org. Once installed …
read more"Tagging a git repo for a Release "
I think it is good practise to create a read only tag when releasing an application. This allows you to …
read more"Sinatra Heroku and config.ru"
Rack applications often require a config.ru for deployment. The standard config.ru for classic sinatra applications is well documented …
read more"Sinatra Session Extension"
I have just started to use a sinatra extensions called Sinatra Session. The write up on the main site is …
read more"Sinatra reload source file changes in development mode"
Sinatra Reloader is a sinatra extension which reloads source files while in development mode, this functionality was removed from base …
read more"Ruby each or delete_if"
In ruby some times you want to iterate over an array and remove items that meet certain conditions, if using …
read more"Storing secret keys in Ruby config files an approach"
I have for a while wondered about an ideal (good) approach to storing api keys in config files in ruby …
read more"Amazon Drops EC2 Web Service Prices"
The new EC2-Pricing also includes a new Micro service. This micro service is intended for small apps servicing tens of …
read more"Ruby Regular Expressions Lookahead / Lookbehind"
I recently discovered a feature of regular expressions called lookahead. This means for a match the lookahead must exist but …
read more"Ruby Time save and Restore (serialise)"
One method to save a time and restore it correctly:
read moredef get_time_run ## File Access based on ## http://rubylearning.com/satishtalim …"Error: NoMethodError: undefined method `compact' for nil:NilClass"
When running a sequel migration I kept getting this error:
Error: NoMethodError: undefined method `compact' for nil:NilClassMy setup …
read more"Active Record attributes simplify update and create."
In Active Record when updating records I used to have an very manual process to this some thing like:
read more@todo …"Active Record create unique or return existing element"
When working with databases it is often a requirement to have unique elements (columns) which are not the primary key …
read more"Activerecord queries on table joins"
An example of joining tables through active record models. There is a good tutorial on the basics of Activerecord joins …
read more"Benchmark your website for load times."
I have been wondering how to do this for a while and accidentally discovered it while perusing this heroku page …
read more"Turn a .jar file into a mac .app"
Following this article lets you turn a executable java .jar into a mac appliction (.app). The Tools are only available …
read more"Installing git on a clean build of OS X"
"Get client IP on Heroku"
I have been trying to use the GeoIP Rack App, by copying this gist in my Rack stack with a …
read more"[vim] Indenting with Vim "
"jQuery clear form on focus and restore on exit"
I used this as a jQuery reference to hide and show default text in forms.
read more<head> <script type=”text/javascript …"Vim show lines over 80 charaters long."
This snippet can be added to you ~/.vimrc to highlight long lines.
read more" Highlight lines over 80 characters long with red …"Vim search and replace"
To search in Vim just press (apple-f for macvim) / then search string.
/searchThis will highlight all occurrences of 'search' …
read more"Creating executable gems"
This is not necessarily the correct way of creating executable gems but a method which worked for me.
Assuming we …
read more"gem install memory_usage"
Just released my first gem 'memory_usage' Version 0.0.1.
$ gem install memory_usageAssuming the gems folder has been set-up …
read more"Ruby runnable and includeable"
I might have just made up includable, but I like it.
Some times you have written a ruby script (using …
read more"GitHub command line tools with static paths"
I have written a few command line tools in ruby which I use to perform file system maintenance. Mainly sorting …
read more"Super simple Ruby list directory contents"
"Stop git status monitoring file permissions"
By default git status returned differences in file permissions. To turn if off run:
read more$ git config core.filemode false"Ruby Memory Issue on Web Faction"
"Sinatra File Upload"
A simple Sinatra web app to upload a single file. Also available as a gist, based on http://pastie.caboo …
read more"Ruby, Ruby, Ruby, why are you so wierd at times?"
This feature of ruby keeps catching me out as the behaviour is quite unexpected (by me).
I can use a …
read more"Testing tweets from Production server This should be working!"
"Ruby incase sensitive sort"
Ruby has a .sort method which sorts basic objects. it is case sensitive though so Zebra is before apple. Using …
read more"Ruby and gemspec"
I have just forked and cloned a project on github and discovered *.gemspec files. They are a nice way of …
read more"Ruby .nil? tests fail ? you really want ||="
I recently discovered ||= in ruby. Its main use is for initialising a variable if it does not already exists, this …
read more"Installing the ruby gem twitter on webfaction"
[Update]
read more
As this is a long post I am putting this update at the top. If you just want to …"gem install with out the docs"
When I install gems on my server I do not get any of the documentation which is normally 3-5 times …
read more"Sinatra blog retrieving next and previous ids"
When displaying blog/articles it is often nice to have previous and next posts. Simply -1 +1 from the current …
read more"Sequel ORM Migrations"
"FourThirds Sinatra RESTful example"
"Ruby include (require) local files"
"Ruby Logger"
"Ruby Performance Measure"
"Sinatra 1.0 Released"
Sinatra 1.0 has been released!
When you install the new version the old one are still left behind. This …
read more"Sinatra and compass sending compressed cached CSS"
"GitX"
Git has a hand full of GUIs available on Mac OS X, gitk proved a little tricky to use but …
read more"Ruby Time Formats"
I have been playing around with getting my blog posts timestamped I found the Ruby Time Docs to be very …
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