Haskell is a strongly typed functional language. In this QuickByte you will learn how to setup Haskell at CARC and create a simple matrix multiplication project using stack.
On Wheeler:
First we will install and load the stack environment:
-
module load miniconda3 -
conda create -n haskell stack -c conda-forge -
source activate haskell
Or, alternatively, load the spack module:
module load haskell-stack-stable-gcc-4.8.5-exczvin
Please note that you should choose one method for using Haskell-Stack, Anaconda or the installed module, as you can run into compatability issues switching between methods.
Now create a new stack project:
-
stack new matmul new-template -
cd matmul
Edit the main source file with your preferred text editor:
emacs app/Main.hs
The following code creates and multiplies two 4x4 matrices:
module Main where
import Lib
import Data.Matrix
main :: IO ()
m1 = matrix 4 4 $ \(i,j) -> 2*i - j
m2 = matrix 4 4 $ \(i,j) -> 2*i - j
test = multStd m1 m2
main = do
putStrLn (show test)Add the dependency on the matrix package to the project:
-
emacs package.yaml -
Add "- matrix" under dependencies in the executables section so it reads:
dependencies:
- matmul
- matrix
Build your project:
stack build
Run your compiled program:
(haskell) mfricke@wheeler-sn:~/matmul$
.stack-work/install/x86_64-linux/lts-13.17/8.6.4/bin/matmul-exe
┌ ┐
│ -18 -16 -14 -12 │
│ 14 8 2 -4 │
│ 46 32 18 4 │
│ 78 56 34 12 │
└ ┘