How to resolve"Unable to perform assignment because the left and right sides have a different number of elements."?

Why i am getting this error?

Unable to perform assignment because the left and right sides have a different number of elements.

Error in goldkasamiikron (line 29)

y(idx) = exp(1i * arg) .* newCode(1:length(idx));

function y = goldkasamiikron(fs, prf, pw, bw, fcent)
    % Compute pulse repetition interval (PRI)
    pri = 1 / prf;

    % Create time vector for one PRI
    t = 0:1/fs:pri;
code1 = comm.GoldSequence('FirstPolynomial','x^6+x^5+1', 'FirstInitialConditions',[ 0 0 0 0 0 1], 'SecondPolynomial','x^6+x^5+x^4+x+1', 'SecondInitialConditions',[0 0 0 0 0 1], 'Index',1, 'SamplesPerFrame',63);

gold_code = code1();
gold_code = 2.*gold_code - 1;

% Generate second kasami code
kasamiseq = comm.KasamiSequence('Polynomial',[6 5 4 1 0], ...
    'InitialConditions',[ 0 0 0 0 0 1],'SamplesPerFrame', 63);
kasami_code = kasamiseq();
kasami_code = 2.*kasami_code - 1;

% Construct new code
newCode = kron(gold_code, kasami_code); % Construct new code using Kronecker product

    % Frequency limits
    fl = fcent - bw/2;
    fh = fcent + bw/2;

    % Create pulsed waveform
    y = zeros(size(t));
    idx = find(t <= pw);
    arg = 2 * pi * fl * fh / bw * pw * log(1.0 - bw * t(idx) / fh / pw);
    y(idx) = exp(1i * arg) .* newCode(1:length(idx));

   
end

[Star Strider]

Provide two or more sample sets of arguments to your function.

Answer 1

[Walter Roberson]

My guess at the moment is that you are operating on a combination of row vector and column vector, which would give you a full 2D array as a result.

My guess is that newCode(1:length(idx)) comes out as a column vector.

[Basmah Ahmad]

Yes, Mr Walter Roberson your guess was right. It was a column vector and when i changed it to row vector, i got my result. Thank you!