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Julien Lengrand-Lambert
2018-05-03 08:22:48 +02:00
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Homework/Week1/laff_dot.m Normal file
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## Copyright (C) 2018 julien Lengrand-Lambert
##
## This program is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/>.
## Author: julien Lengrand-Lambert <jlengrand@juliens-MacBook-Pro.local>
## Created: 2018-05-03
function [ alpha ] = laff_dot (x, y)
y_out = y;
function isVector = isVector(x)
isVector = (size(x, 1) == 1 || size(x, 2) == 1);
endfunction
function isCompatible = isCompatible(x, y)
isCompatible = (isequal(size(x), size(y)) || isequal(size(x), fliplr(size(y))));
endfunction
if !isVector(x)
disp('Error : x not a vector');
y_out = 'FAILED';
return
end
if !isVector(y)
disp('Error : y not a vector');
y_out = 'FAILED';
return
end
if !isCompatible(x, y)
disp('Error : x and y are not compatible');
y_out = 'FAILED';
return
end
alpha = 1;
endfunction

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Homework/Week1/test_dot.m Executable file
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% Create some vectors
x = [
1
2
3
]
y = [
0
-1
-2
]
z = [
4
3
2
1
]
% test dot product of column vector with column vector
disp( 'dot product of column vector with column vector' )
if ( isequal( laff_dot( x, y ), x' * y ) )
disp( 'TEST PASSED' )
else
disp( 'TEST FAILED' )
end
disp( ' ' )
% test dot product of column vector with row vector
disp( 'dot product of column vector with row vector' )
if ( isequal( laff_dot( x, y' ), x' * y ) )
disp( 'TEST PASSED' )
else
disp( 'TEST FAILED' )
end
disp( ' ' )
% test dot product of row vector with column vector
disp( 'dot product of row vector with column vector' )
if ( isequal( laff_dot( x', y ), x' * y ) )
disp( 'TEST PASSED' )
else
disp( 'TEST FAILED' )
end
disp( ' ' )
% test dot product of row vector with row vector
disp( 'dot product of row vector with row vector' )
if ( isequal( laff_dot( x', y' ), x' * y ) )
disp( 'TEST PASSED' )
else
disp( 'TEST FAILED' )
end
disp( ' ' )
% test dot product of column vector with column vector (wrong size)
disp( 'dot product of column vector with column vector (wrong size)' )
if ( isequal( laff_dot( x, z ), 'FAILED' ) )
disp( 'TEST PASSED' )
else
disp( 'TEST FAILED' )
end
disp( ' ' )
% test dot product of column vector with row vector (wrong size)
disp( 'dot product of column vector with row vector (wrong size)' )
if ( isequal( laff_dot( x, z' ), 'FAILED' ) )
disp( 'TEST PASSED' )
else
disp( 'TEST FAILED' )
end
disp( ' ' )
% test dot product of row vector with column vector (wrong size)
disp( 'dot product of row vector with column vector (wrong size)' )
if ( isequal( laff_dot( x', z ), 'FAILED' ) )
disp( 'TEST PASSED' )
else
disp( 'TEST FAILED' )
end
disp( ' ' )
% test dot product of row vector with row vector (wrong size)
disp( 'dot product of row vector with row vector (wrong size)' )
if ( isequal( laff_dot( x', z' ), 'FAILED' ) )
disp( 'TEST PASSED' )
else
disp( 'TEST FAILED' )
end

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README.md Normal file
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# LAFF: Linear Algebra - Foundations to Frontiers
This repo contains code that is used to follow the [LAFF: Linear Algebra - Foundations to Frontiers](https://www.edx.org/course/laff-linear-algebra-foundations-to-frontiers) course on [edx](https://www.edx.org/).
Most of the code is given at the beginning of the course.
The code I have written myself is located in the **Homework** folder.
## Running things
You will need [Matlab](https://matlab.mathworks.com/) or [Octave](https://octave.org/) to run things
Personally, I used the Octave CLI and [Microsoft Code](https://code.visualstudio.com/) with the [Octave plugin](https://marketplace.visualstudio.com/items?itemName=toasty-technologies.octave).