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Embedded MATLAB FUnction as elaboration block only

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cyberdyne
cyberdyne 2011-2-23
关闭： MATLAB Answer Bot 2021-8-20
Hi,
I have to made an Embedded MATLAB Function which puts input in "for" and/or "if" loop(s) and takes output from loop conditions.
The real problem, infacts, is that Embedded MATLAB Function wants output DIRECTLY connected to input only.
Thanks for kindness

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回答（3 个）

Kaustubha Govind
Kaustubha Govind 2011-2-23
From what I understand, I think the real reason may be because you do not pre-allocate memory for the output. See Assign Variables Explicitly Before Using Them.
For example:
function X = fcn %#eml
N = 5;
X = zeros(1,N); % explicitly pre-allocate output
for i = 1:N
if mod(i,2) == 0
X(i) = i;
else
X(i) = 0;
end
end
If this is not the answer you are looking for, could you please post a simple code snippet so it is easier to understand the question?
cyberdyne
cyberdyne 2011-2-23
The problem is this: I've two changing inputs to EML; call them s1 and s2. They are two definite integrals each of them from t0 to t0+Ts (where Ts is clock time and t0 is the starting istant).Therefore they are two successions of numbers. I want that when this two inputs have the same value, output is that value. I try with following code:
function y=fcn (s1, s2)
m=length(s2);
n=length(s1);
for i=1:n
for j=1:m
if s1(i)==s2(j)
y=s1(i);
break
end
end
end
but EML wants that y must be ALWAYS directly bind to inputs. It doesn't want loop conditions.
Kaustubha Govind
Kaustubha Govind 2011-2-24
As I described before, you need to pre-allocate 'y' in your code. Since in this case, y is a scalar, you can simply have:
function y=fcn (s1, s2)
y = 0; % Pre-allocate y
m=length(s2);
n=length(s1);
for i=1:n
for j=1:m
if s1(i)==s2(j)
y=s1(i);
break
end
end
end
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cyberdyne
cyberdyne 2011-2-24
Therefore if i take as "else" condition:
else y=NaN;
it means that when s1 is not equal to s2 it returns NaN-elements ?
Kaustubha Govind
Kaustubha Govind 2011-2-25
Sure, you could do that. Just make sure that you pre-allocate 'y' before the for-loops though.

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