Hello, I have a structure I want to get the data of 2nd field but not using app.temp.Channel(2).data I want to use the name field instead. something like mydata = app.temp.Channel.data(app.temp.Channel.name == 'U1'); but I have error (Error using == ; Too many input arguments). May I know some suggestions, How to do this in a simple manner without using complex for loops.

Getting one field data using other field in struct

John D'Errico 2020-2-13

You posted the same question 3 times. I'll close two of them.

Temu Gautama 2020-2-13

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Does this work?

app.temp.Channel.('U1')

Timon Rayis 2020-2-13

@Temu Gautama, No it does not work.

Reference to non-existent field 'U1'.

Timon Rayis 2020-2-13

@John, No I did not submit the question 3 times. there is a delay with the community site now, I don't know why. While autosaving the question, it is posted multiple times I guess.

Temu Gautama 2020-2-13

在 MATLAB Online 中打开

Ah, sorry, misinterpreted the table. Then it should be something like this:

mydata = app.temp.Channel.data( cellfun(@( x )strcmp( x, 'U1' ), {app.temp.Channel(:).name} ));

Timon Rayis 2020-2-13

编辑：Timon Rayis 2020-2-13

@Temu Gautama, I am getting error again.

Expected one output from a curly brace or dot indexing expression, but there

were 3 results.

Temu Gautama 2020-2-13

在 MATLAB Online 中打开

Hmm let's see

{app.temp.Channel(:).name}

should give you

ans = 
    'U1'    'U2'    'U3'

So if you do the cellfun-strcmp

cellfun(@( x )strcmp( x, 'U1' ), {app.temp.Channel(:).name} )

it should yield

ans =
     1     0     0

which is then used for (logical) indexing. So I don't really see where the error is coming from. Could you try these lines separately?

Timon Rayis 2020-2-13

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{app.temp.Channel(:).name}

For this line, I am getting

ans = 
    1x3 cell array
    {'U1'} {'U2'} {'U3'}

Timon Rayis 2020-2-13

编辑：Timon Rayis 2020-2-13

在 MATLAB Online 中打开

Also, for

cellfun(@( x )strcmp( x, 'U1' ), {app.temp.Channel(:).name} )

I am getting

ans = 
    1x3 logical array
    1  0  0

Timon Rayis 2020-2-13

在 MATLAB Online 中打开

but when I try

mydata = app.temp.Channel.data( cellfun(@( x )strcmp( x, 'U1' ), {app.temp.Channel(:).name} ));

It says

Expected one output from a curly brace or dot indexing expression, but there
were 3 results.

Timon Rayis 2020-2-13

@Temu Gautama Thanks.

I made a small change (.data) in that line comes at last.

And now I can get the data.

Getting one field data using other field in struct

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