How to call a function by assigning a string to a variable?

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Arif Ahmed
Arif Ahmed 2020-12-21
编辑： Arif Ahmed 2020-12-21
Please consider the following:
I write a function file named 'case_a' from a function 'test'.
output = 'case_a';
matlabFunction(test, 'file', output, 'Optimize', false);
Because my variable output is going to be changing every iteration, I would like to be able to call the actual output function. Specifically, let's say I run a new simulation and I would like to call the function case_a(input) with some input vector. But I would like to first assign the saved function file to my 'output' variable such that I can call output(input) in every run. In this case output should actually be the case_a. In another case I want to assign 'case_b' in output, such that I can still call it as output(input).
Regards
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Arif Ahmed
Arif Ahmed 2020-12-21
Let me try again.
I run a simulation, which gives me an output file named 'case_a.m'
output = 'case_a';
matlabFunction(test, 'file', output, 'Optimize', false);
I run another simulation, which gives me an output file named 'case_b.m'
output = 'case_b';
matlabFunction(test, 'file', output, 'Optimize', false);
I, later, want to repeat the calculation with some new data for both 'case_a' and 'case_b' functions. However, I want to automate calling them by running a loop as I have the function names in a string such as
function_name = ['case_a'; 'case_b']
How can I execute the functions from the list in function_name without having to write case_a and case_b manually.
Does this make any sense?

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采纳的回答

Matt J
Matt J 2020-12-21
编辑：Matt J 2020-12-21
feval(output,arg1,arg2,...)
or
fun=str2func(output);
fun(arg1,arg2,...)

更多回答（1 个）

Matt J
Matt J 2020-12-21
编辑：Matt J 2020-12-21
Since you've set Optimize=false, I don't know why you are sending the result to a file. You may as well just use the output of matlabFunction() directly,
fun=matlabFunction(test);
fun(arg1,arg2,...)
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Matt J
Matt J 2020-12-21
But once fun is created, you can reuse it and/or save it to a file. Why would you need to call matlabFunction every time?
Aside from that, if matlabFunction is taking a long time, it likely means you are doing something symbolically that should really be done numerically.
Arif Ahmed
Arif Ahmed 2020-12-21
编辑：Arif Ahmed 2020-12-21
I am calling matlabFunction for all the different problems that I need to investigate. Essentially making function files that have 6,000 to 12,000 equations in some of them.
Once they are saved, I can reuse them later even if I clear the workspace. I just needed to know how to call them, which str2func does.
I am using the symbolic expressions as I need to get the Jacobian out of those 12,000 equations.
I am just trying out different coding/solution approaches. Trying to investigate what are the differences in coding and execution.

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