Masked Subsystem: How to pass a double vector to a constant?

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This is a slightly long-winded problem, but should be easy to follow along.
End goal : Input a 'double' vector into a C++ S Function by assigning it to a Constant.
Starting point: A function within the Dialog Callback of my masked subsystem returns the double vector that I need.
Steps in the middle: So I have a double vector as an input, I need a double vector as an output, but I cannot pass the vector directly, because set_param requires that I pass the value as a string.
Problem: What I tried is this:
set_param(gcb,'refNameArray',num2str(refName));
where,
  • gcb (correctly) returns the block from within which I am doing everything.
  • refNameArray is the parameter which needs to be assigned the double vector
  • refName is the vector, in 'double' form, that I have available within the dialog callback of the mask.
I use num2str because I cannot directly assign a vector, I must input it as a string. But, even using num2str, I get an error saying
Invalid Setting in Block <blockName> for parameter 'Value'.
Any suggestions?

Answers (2)

Yao Li
Yao Li on 28 Jan 2014
I'm not quite sure about your issue. In general, if you want to assign a value to a parameter in a masked subsystem, add it as a parameter in the Mask Editor as shown in the following link
and then assign the value by
refNameArray=refName;
In case you do need to convert the value to a string first, try converting the array to a cell and converting it back to a double type array by the command sprintf()
  1 Comment
Kaustubha Govind
Kaustubha Govind on 31 Mar 2014
I agree. You may to test what num2str(refName) returns to see why that may be resulting an error.

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Fangjun Jiang
Fangjun Jiang on 1 Aug 2022
I don't know why this old question suddenly appears at the top.
I believe the answer to this question is a trick. Use mat2str(), instead of num2str(). So when evaluated, the string will return an array.
a=1:3
a = 1×3
1 2 3
b=num2str(a)
b = '1 2 3'
c=mat2str(a)
c = '[1 2 3]'
eval(c)
ans = 1×3
1 2 3
eval(b)
Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

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