List of structures as input to getfield()?

The getfield() is defined as:

value = getfield(myStruct, 'myField').

Now I have a list of structures, myStructList, and I'd like getfield() to run through the filenames of that list like:

value(i) = getfield(myStructList(i).name,'myField')

But this gives an error message, any idea how this can be done?

Error messages are:

Attempt to reference field of non-structure array.

Error in getfield (line 36)
  f = s.(deblank(strField)); % deblank field name

[Star Strider]

What error message does it give?

Please copy all the red text from the Command Window and Edit your Question to include it.

[uffeaf]

Thanks, done.

[Image Analyst]

How did you get myStructList? Did you get it from a call to dir()?

Answer 1

[Nobel Mondal]

First Argument of 'getfield' should be a struct. `myStructList(i).name` probably refers to a char type variable. If myStructList is essentially an array of structures, you could try

>> getfield(myStructList(i),'myField')

However, as Star Strider said, we could be more useful after looking at the error stack.

Answer 2

[Walter Roberson]

In your code,

myStructList(i).name

would be a file name. And you are then trying to get the MyField field of the file name.

Is myStructList(i).name intended to be a string that is a variable name and you want to look up that variable and get the MyField field of that variable? If so, don't do that.

If you absolutely must work with strings that name variables, then put all of the variables as fieldnames into a single structure. For example

MyStruct.vodoo23
MyStruct.skidoo

instead of two variables, one named vodoo23 and the other named skidoo.

If you put them all in one structure, then you can use dynamic field names.

value(i) = MyStruct.(myStructList(i).name).myField);