Can I store and call functions from within a struct?

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Julian 2018-9-3

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评论： Hank 2019-5-1

Hi everyone,

i want to create a struct with the following fields: analysis(i).type (this is a list of different types of possible analysis) analysis(i).function (this should contain the specific function that should be executed, if a specific type of analysis was chosen)

I've tried some things so far, but nothing worked...so i'm wondering if this is even possible?

Thank you!

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Answer 1

Stephan 2018-9-3

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编辑：Stephan 2018-9-3

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Hi,

you can store function handles in a struct and use them like this:

fun1 = @(x,y) x + y
fun2 = @(x,y) x - y
analysis.add = fun1
analysis.subtract = fun2
res1 = analysis.add(1,2)
res2 = analysis.subtract(5,3)

Best regards

Stephan

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Guillaume 2018-9-3

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And if the function to execute is a m file (as opposed to anonnymous functions in Stephan and Stephen's example), then:

%store function handle to m file myfunc.m:
analysis.add = @myfunc

Julian 2018-9-3

Thank you guys :)

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Answer 2

Hank 2019-5-1

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编辑：Hank 2019-5-1

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To further this question, I would like to use fields of the struct as parameters in the functions, hopefully without having to write an entire class for this purpose.

for example

circ = struct('Radius',     3    ,...
              'Area',       @() pi*Radius^2 );

where 'radius' in the anon function somehow references circ.Radius

Then, radius may be change by other programs or the user action but whenever I access circ.Area, it references the current radius.

Cheers, Henry

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Guillaume 2019-5-1

You can link to this question in your own. We can't answer an Answer, only comment on it. You can't accept a comment as resolving a question asked in an answer.

Hank 2019-5-1

Fair enough. I think I've resolved that this can only be acheived by creating a class for the object i'm interested. There's no support of methods for a struct.

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