Load Variable for Use in Simulink MATLAB Function Block

Ali
2012 4 19
1 个回答
4 次查看（30 天）

0 个投票

I have been working on this for a while, but cannot get it to work. Basically, I have a MATLAB function block used in a Simulink model. In this block, I have something along the lines of
persistent a
if isempty(a)
load a % a is MAT file with 'a' defined in it
end
%use variable a
But that gave an error. So I tried this
persistent a
if isempty(a)
a = load('a.mat') %a is a structure now
end
%use a.a now
That gave the error: Attempt to extract field 'a' from 'mxArray'.
I'm not sure what to do.

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TAB
TAB 2012-4-19
How you are using structure "a" further?
This error will appear probably if you will assign a.a (which is a matlab variable) directly to output.
Ali
Ali 2012-4-19
I use a in numerous MATLAB functions.
sum
mean
bsxfun (I say a = bsxfun(@minus,a,b);)
numel
I also do .^2 on it too.
And in these many functions, i often index into a
i.e. (:,2) or (:,1), etc.

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回答（1 个）

Kaustubha Govind
Kaustubha Govind 2012-4-19

1 个投票

It looks like you are using 'a' like a parameter. Why not declare it as one, so that the value is automatically picked up from the workspace? See Parameter Arguments in MATLAB Function Block Functions. Just remember to not "write" to a. Treat it as read-only.

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Ali
Ali
2012-4-19

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