how to implement structfun using 2 variables

Hi all,

Is it possible to have a code which is similar to

S.value1.x = 1;
S.value2.x = 10;
S.value3.x = 17;
S1.value1.x = 12;
S1.value2.x = 11;
S1.value3.x = 13;
S2.value1.x = 142;
S2.value2.x = 11;
S2.value3.x = 113;
output1 = structfun(@(In, val)In.val.x,S,value1)
output2 = structfun(@(In, val)In.val.x,S1,value1)

Output:

output1 = 1

output2 = 12

Here I need to changing parameter.

Thanks,

Raghunandan V

[Stephen23]

This seems to be closely related, and has some relevant answers:

https://www.mathworks.com/matlabcentral/answers/465424-acces-data-in-nested-structure

Answer 1

[Guillaume]

Not entirely sure what you're asking, structfun applies the same function to each field of a scalar structure. It doesn't look like it's what you're after at all.

If you're asking how to get the value of a particular field having its name stored as text, yes this can be done easily

fname = 'value1';
S.(fname).x

Hopefully, your example is for illustration and you're not using numbered variables and numbered field names. Numbered anything is a flawed design and you should replace that with proper indexing:

S(1).value(1).x = 1
S(1).value(2).x = 10;
S(1).value(3).x = 17;
S(2).value(1).x = 12;
S(2).value(2).x = 11;
S(2).value(3).x = 13;
S(3).value(1).x = 142;
S(3).value(2).x = 11;
S(3).value(3).x = 113;

which completely removes the need to generate field names as strings.

Answer 2

[Jan]

This seems to be much easier:

field   = 'value1';
output1 = S.(field).x
output1 = S1.(field).x

structfun iterates over the fields of a struct. So it is not clear why you want to use it to get the values of a nested substruct.