assigning file from the struct

Hi,

I am looking for a some help in reading the file from teh sturct.

Fo example, I have sturct files named 'A' , 'B' , 'C' ,'D' etc. and inside each struct file I have many arrays stored (e.g. X, Y, Z,) inside teh struct file A.

Now, to call array 'X' from the each struct file I am using A.X; B.X; C.X; D.X. Though this is working fine and in my code everytime I have to change X and Y manually wherever thats been called. Is there any aletrnative way, essentially I am looking for something like

S = X;

A.S

B.S

C.S

D.S

[Jan]

What do you call "struct file"? Do you mean MAT files containing the struct? Did you import the data using data=load('A.mat') already?

[Turbulence Analysis]

It's in the form of 1x1 struct

[Stephen23]

"I have sturct files named 'A' , 'B' , 'C' ,'D' etc."

A file is some data saved on a storage device (e.g. hard-drive): https://en.wikipedia.org/wiki/Computer_file

A structure is a data class used in MATLAB memory: https://www.mathworks.com/help/matlab/structures.html

What is a "struct file" ? I have never heard of such a thing, nor is it clear how such a thing would even exist, or be used.

Answer 1

[Jan]

S = 'X';
A.(S)
B.(S)
C.(S)
D.(S)

This is called "dynamic field names".

[Turbulence Analysis]

Thank, Jan.

Just another quick question

Lets say

T1 = A_60.X;

T2 = A_60.X1;

T3 = A_60.X2;

In the above example is it possible to define variable instead of number 60. For e.g if I have number 60 stored in some variable C, is it possible to use like this

T1 = A_C.X;

T2 = A_C.X1;

T3 = A_C.X2;

[Stephen23]

"e.g if I have number 60 stored in some variable C, is it possible to use like this"

It is certainly possible, if you want to force yourself into writing slow, complex, inefficient, obfuscated, insecure, buggy code that is hard to debug:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Best avoided.

Use indexing, just like MATLAB is designed for.

[Jan]

@Turbulence Analysis: Stephen23 hits the point. Read and consider the linked tutorial carefully.

T3 = A_60.X2 looks like you have hidden the indices 3, 60 and 2 in the names of the variables or fields. This makes it much harder to access the fields, while using real indices is trivial:

T(3) = A(60).X(2)