How can I send data from one function to another?

Question

Michael cornman 2016-7-5

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https://ww2.mathworks.cn/matlabcentral/answers/293850-how-can-i-send-data-from-one-function-to-another

评论： James Tursa 2016-7-7

I have a function that is reading values from a .txt file using fscanf, and storing those values in an array.

Now I have another function that needs to use that array, but I am getting an error that says the variable does not exist.

Research tells me that after a function is done running, the variable leaves the workspace.

How can I pass this data into the 2nd function?

Thank you!

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amine&& 2016-7-5

What is the data type that is in the .txt file?

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Answer 1

James Tursa 2016-7-6

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You can pass the variable out from the first function and pass it in to the other function. E.g.

% File fun1.m
function result = fun1
result = rand(3);
end
% File fun2.m
function fun2(x)
disp(x)
end

And then at the command line:

>> x = fun1
x =
    0.7577    0.6555    0.0318
    0.7431    0.1712    0.2769
    0.3922    0.7060    0.0462
>> fun2(x)
    0.7577    0.6555    0.0318
    0.7431    0.1712    0.2769
    0.3922    0.7060    0.0462

Another way is to use the 'userdata' property of the 0 process. E.g.,

% File fun3.m
function fun3
result = rand(3);
set(0,'userdata',result);
disp(result);
end
% File fun4.m
function fun4
x = get(0,'userdata');
disp(x)
end

Then at the command line:

>> fun3
0971    0.3171    0.4387
8235    0.9502    0.3816
6948    0.0344    0.7655
>> fun4
0971    0.3171    0.4387
8235    0.9502    0.3816
6948    0.0344    0.7655

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Michael cornman 2016-7-6

Using the 'UserData' property of the 0 process works for calling 1 variable. What if I wanted to call more?

James Tursa 2016-7-7

You can use a structure. E.g., the fieldname of the structure would indicate which variable you are dealing with. In this case when you want to set a variable, you would get the structure first, assign the field to your new value, then set the structure back.

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