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From: fabian on 9 Jun 2010 11:14
Dear all,

I am having some troubles with a standalone created with rtw from a simulink model, which crashes when executed (window pops up, saying this .exe stopped working). The simulink model consists of some embedded matlab function blocks. I could narrow down the line which makes troubles (see below). However, if I separate this single embedded matlab function block and compile it by itself, it runs fine. So I am thinking that the problem might be related to the allocated memory or something??

[Q2,R2] = qr(MQ);
row = 0;
col = 0;
[row,col]=size(R2);
i =0;
threshold = 8e-12;
for j=1:row
if (sum(abs(R2(j,:)))<threshold)
i=i+1;
TEMP(:,i)=Q2(:,j); %<-- this causes a crash in the overall model
end
end
NULL_MQ = TEMP';


Furthermore, I get the same problem when using a Memory block (or Unit delay block)somewhere within the overall model. The standalone of the overall model crashes, but if I compile a simpler model with these blocks it runs fine?

I dont even know what to look for?

I am using Matlab R2010a on Windows 7.


Any hints are greatly appreciated.
From: Tim on 9 Jun 2010 12:31
"fabian " <fabian.risch(a)mavt.ethz.ch> wrote in message <huob3s$e6v$1(a)fred.mathworks.com>...
> Dear all,
>
> I am having some troubles with a standalone created with rtw from a simulink model, which crashes when executed (window pops up, saying this .exe stopped working). The simulink model consists of some embedded matlab function blocks. I could narrow down the line which makes troubles (see below). However, if I separate this single embedded matlab function block and compile it by itself, it runs fine. So I am thinking that the problem might be related to the allocated memory or something??
>
> [Q2,R2] = qr(MQ);
> row = 0;
> col = 0;
> [row,col]=size(R2);
> i =0;
> threshold = 8e-12;
> for j=1:row
> if (sum(abs(R2(j,:)))<threshold)
> i=i+1;
> TEMP(:,i)=Q2(:,j); %<-- this causes a crash in the overall model
> end
> end
> NULL_MQ = TEMP';
>
>
> Furthermore, I get the same problem when using a Memory block (or Unit delay block)somewhere within the overall model. The standalone of the overall model crashes, but if I compile a simpler model with these blocks it runs fine?
>
> I dont even know what to look for?
>
> I am using Matlab R2010a on Windows 7.
>
>
> Any hints are greatly appreciated.

I would examine very carefully the auto generated code. In my experience I have seen a lot of embedded matlab generate incorrect c code.
From: fabian on 10 Jun 2010 12:30
> I would examine very carefully the auto generated code. In my experience I have seen a lot of embedded matlab generate incorrect c code.

Hi Tim,
thanks for your anwer. I had a look at the generated code, but couldnt find any possible error sources. Can you give me a hint what to look for? Or in other words, in which cases did you experience problems?

thanks again
From: Steven Lord on 10 Jun 2010 12:56

"fabian " <fabian.risch(a)mavt.ethz.ch> wrote in message
news:huob3s$e6v$1(a)fred.mathworks.com...
> Dear all,
>
> I am having some troubles with a standalone created with rtw from a
> simulink model, which crashes when executed (window pops up, saying this
> .exe stopped working). The simulink model consists of some embedded matlab
> function blocks. I could narrow down the line which makes troubles (see
> below). However, if I separate this single embedded matlab function block
> and compile it by itself, it runs fine. So I am thinking that the problem
> might be related to the allocated memory or something??
>
> [Q2,R2] = qr(MQ);
> row = 0;
> col = 0;
> [row,col]=size(R2);
> i =0;
> threshold = 8e-12;
> for j=1:row
> if (sum(abs(R2(j,:)))<threshold)
> i=i+1;
> TEMP(:,i)=Q2(:,j); %<-- this causes a crash in the overall
> model

I would be suspicious of this growing array in the loop -- I would try
preallocating TEMP outside the loop and fill it in inside the loop, trimming
it to the appropriate size if necessary.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
To contact Technical Support use the Contact Us link on
http://www.mathworks.com


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