Prev: PLP algorithm, few questions
Next: Create a directory with a specified name
From: Haitham Tahbub on 30 Apr 2010 08:00
Hi all ,

i have a function called the dynamic time warping.

i have the m file function and i want to build this function in Simulink .
i tried days and weeks to bulid this as blocks but i failed .

I asked for this , they told me that converting it to s-function block is easier but i have no idea of s-function from m file .

help me please in imleminting the s-function code that i can load to the s-function block and use one block for this function ,

My function code is :-

function [p,q,D] = dp(M)
% [p,q] = dp(M)
% Use dynamic programming to find a min-cost path through matrix M.
% Return state sequence in p,q

[r,c] = size(M);

% costs
D = zeros(r+1, c+1);
D(1,:) = NaN;
D(:,1) = NaN;
D(1,1) = 0;
D(2:(r+1), 2:(c+1)) = M;

% traceback
phi = zeros(r,c);

for i = 1:r;
for j = 1:c;
[dmax, tb] = min([D(i, j), D(i, j+1), D(i+1, j)]);
D(i+1,j+1) = D(i+1,j+1)+dmax;
phi(i,j) = tb;
end
end

% Traceback from top left
i = r;
j = c;
p = i;
q = j;
while i > 1 & j > 1
tb = phi(i,j);
if (tb == 1)
i = i-1;
j = j-1;
elseif (tb == 2)
i = i-1;
elseif (tb == 3)
j = j-1;
else
error;
end
p = [i,p];
q = [j,q];
end

% Strip off the edges of the D matrix before returning
D = D(2:(r+1),2:(c+1));

==============
Thanks all
Regards
Haitham
From: Sunny Billava on 13 May 2010 01:56
hey juss use a level-2 M-File S-Function... register ur m-file function call in the S-function template... & rest is quite easy...

Refer:
http://www.mathworks.com/access/helpdesk/help/toolbox/simulink/sfg/f7-67622.html


"Haitham Tahbub" <the_mummy_n1(a)hotmail.com> wrote in message <hregol$j38$1(a)fred.mathworks.com>...
> Hi all ,
>
> i have a function called the dynamic time warping.
>
> i have the m file function and i want to build this function in Simulink .
> i tried days and weeks to bulid this as blocks but i failed .
>
> I asked for this , they told me that converting it to s-function block is easier but i have no idea of s-function from m file .
>
> help me please in imleminting the s-function code that i can load to the s-function block and use one block for this function ,
>
> My function code is :-
>
> function [p,q,D] = dp(M)
> % [p,q] = dp(M)
> % Use dynamic programming to find a min-cost path through matrix M.
> % Return state sequence in p,q
>
> [r,c] = size(M);
>
> % costs
> D = zeros(r+1, c+1);
> D(1,:) = NaN;
> D(:,1) = NaN;
> D(1,1) = 0;
> D(2:(r+1), 2:(c+1)) = M;
>
> % traceback
> phi = zeros(r,c);
>
> for i = 1:r;
> for j = 1:c;
> [dmax, tb] = min([D(i, j), D(i, j+1), D(i+1, j)]);
> D(i+1,j+1) = D(i+1,j+1)+dmax;
> phi(i,j) = tb;
> end
> end
>
> % Traceback from top left
> i = r;
> j = c;
> p = i;
> q = j;
> while i > 1 & j > 1
> tb = phi(i,j);
> if (tb == 1)
> i = i-1;
> j = j-1;
> elseif (tb == 2)
> i = i-1;
> elseif (tb == 3)
> j = j-1;
> else
> error;
> end
> p = [i,p];
> q = [j,q];
> end
>
> % Strip off the edges of the D matrix before returning
> D = D(2:(r+1),2:(c+1));
>
> ==============
> Thanks all
> Regards
> Haitham
 | 
Pages: 1
Prev: PLP algorithm, few questions
Next: Create a directory with a specified name