Incorrect use of '=' operator. To assign a value to a variable, use '='. To compare values for equality, use '=='.

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Dorian Le Quilleuc 2022-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/1753160-incorrect-use-of-operator-to-assign-a-value-to-a-variable-use-to-compare-values-for-equal

评论： Rik 2023-2-27

Hello and sorry for the insertion of my code it's my first time using this website. I'm trying to create a structure in order to define my blink spectrum into a variable as to use next in my autoregressive model (ar). But when i try to run the "%% Blink, AR spectrum" section i'm having this error "Incorrect use of '=' operator. To assign a value to a variable, use '='. To compare values for equality, use '=='."

Thanks you for you answers

%% blink, type Spectrum
ltime = time.*ms_to_sec;
[w f] = wt([ltime' detrend(meanBlink)]);
f = 1./f * 3600;
coi =  1./f * 3600;
cycph = 20;
w = mean(abs(w(f<cycph, :)).^2, 2);
%% Blink, AR spectrum
Blink_spectrum = struct(...
    "data.meanBlink" = meanBlink;
    "data.ltime" = ltime';
    "data.detrend" = detrend;
    "data.w" = w;
    "data.f" = f;
    "data.coi" = coi;
    "data.cycph" = cycph);
    
    
    
ar(Blink_spectrum,2)
Error: File: figure3.m Line: 464 Column: 22
Incorrect use of '=' operator. To assign a value to a variable, use '='. To compare values for equality, use '=='.

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Answer 1

Rik 2022-7-4

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https://ww2.mathworks.cn/matlabcentral/answers/1753160-incorrect-use-of-operator-to-assign-a-value-to-a-variable-use-to-compare-values-for-equal#answer_999765

If you want to use the Name=Value syntax, you need to do this:

meanBlink=rand;ltime=rand;detrend=rand;w=rand;f=rand;coi=rand;cycph=rand;
data=struct(...
    meanBlink = meanBlink, ...
    ltime = ltime', ...
    detrend = detrend, ...
    w = w, ...
    f = f, ...
    coi = coi, ...
    cycph = cycph)
data = struct with fields:
    meanBlink: 0.3400
        ltime: 0.8662
      detrend: 0.9240
            w: 0.4217
            f: 0.9188
          coi: 0.9104
        cycph: 0.6672
Blink_spectrum =struct(data=data)
Blink_spectrum = struct with fields:
    data: [1×1 struct]

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Walter Roberson 2023-2-27

When you use = between an option name (or field name) and the associated value, then you do not put the option name inside '' or inside "" .

Also field names for struct() as a call must be plain variable names, with no . in them.

Rik 2023-2-27

Internally Matlab will put double quotes around the first part, so these two syntaxes look the same to the function being called:

SomeFunction(meanBlink = 1)
SomeFunction("meanBlink",1)

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Incorrect use of '=' operator. To assign a value to a variable, use '='. To compare values for equality, use '=='.

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Incorrect use of '=' operator. To assign a value to a variable, use '='. To compare values for equality, use '=='.

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