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Home/ Questions/Quick handling of the: ''Argument to dynamic structure reference must evaluate to a valid field name'' error.
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Arthur Thomas
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Arthur Thomas
Asked: May 18, 20222022-05-18T18:31:50+00:00 2022-05-18T18:31:50+00:00In: Programs

Quick handling of the: ”Argument to dynamic structure reference must evaluate to a valid field name” error.

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Hi developer experts, I have a small but frustrating use case, and so far, I couldn’t get my head around this problem & ideal solution. I am running my command and facing one problem with the argument to dynamic structure reference must evaluate to a valid field name. Below is the command I used:

spectData{1} = 
 
 data: [256x26 double]
 textdata: {1x26 cell}
 colheaders: {1x26 cell}
 Row: [256x1 double]
 Col: [256x1 double]
 Cho: [256x1 double]
 Cho0x25SD: [256x1 double]
 Cho0x2FCit: [256x1 double]
 PCho: [256x1 double]
 PCho0x25SD: [256x1 double]
SDdata = spectData{sliceNum - firstSlice}.(MetabMapSDString);

When I run it, I get the following error:

Argument to dynamic structure reference must evaluate to a valid field name.

I am looking forward to gaining some knowledge from all experts. Thank you, guys!

must evaluate to a valid field name
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    lyytutoria Expert
    2022-06-15T15:14:56+00:00Added an answer on June 15, 2022 at 3:14 pm

    The cause:

    You got this error because instead of passing a string, you mistakenly sent a cell array. Literal strings, on the other hand, are of the char array type. This error also appears in below program:

    fields = {'foo', 'bar'}
    s = struct('foo', 23, 'bar', pi)
    
    for f = fields
    disp(f)
    s.(f) = 0
    end

    Solution:

    You should check your field name, for example with whos and use f = char(f) in your program.

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  2. Arthur Merlin
    2022-05-25T20:46:48+00:00Added an answer on May 25, 2022 at 8:46 pm

    Matlab refers to a string as a cell. Literal strings are of type array. They print differently. A cell string prints as

    ans =
    
     'abc'

    While a regular char array prints,

    ans = 
    abc

    The difference between the two functions is cellstr and char, which convert char arrays to strings.

    In your case, char(MetabMapSDString) should be used as the dynamic struct reference.

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