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How to get all data from m-function?

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Lev Mihailov
Lev Mihailov on 10 Jun 2021
Commented: Stephen on 10 Jun 2021
Hello! I created a function for reading dpv files, it contains many parameters that I receive. But in the example of creating a function, there is only one
function A=ReadDPV(fileName) % When reading a file, 102 values ​​come out
A=0.24*c
A1=0.1*f
B=1.2*b
...
Z2=2.4
end
When I try to read with this function, I only get the value A
X=ReadDPV(fileName)
% X=A;
How to get all 102 values ​​that are read and counted in my function?
  1 Comment
Stephen
Stephen on 10 Jun 2021
Best solution: use a structure.

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Accepted Answer

Max Heiken
Max Heiken on 10 Jun 2021
Hello! The value A is the only one that gets output because that is what you specified in your function declaration. You could instead specify a list of all outputs:
function [A, A2, B, .., Z2] = ReadDPV(fileName)
...
end
But this has its own drawbacks, because you would also need to accept all those values when you call the function:
[A, A2, B, .., Z2] = ReadDPV(fileName);
A perhaps better solution would be to store all these values in one container. If they are of the same type, a vector would work; if you want to still reference them by their name, a struct comes to mind; otherwise a cell array. An example for the struct approach:
function contents = ReadDPV(fileName)
contents = struct();
contents.A=0.24*c
contents.A1=0.1*f
contents.B=1.2*b
...
contents.Z2=2.4
end
And accessing them:
contents = ReadDPV(fileName);
A = contents.A;
...

More Answers (1)

Scott MacKenzie
Scott MacKenzie on 10 Jun 2021
Edited: Scott MacKenzie on 10 Jun 2021
Your function is defined to only return A (which is perhaps a scalar). To return multiples values, return them as elements in a vector and define your function accordingly:
function [A, A1, B, ... ] = ReadDPV(fileName)
A = ...
A1 = ...
...
end
Then, use your function thus:
[x, y, ...] = ReadDPV(...)
x will be A, y will be A1, and so on

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