Arrays have incompatible sizes for this operation.

Question

Jayachander Borker 2023-2-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1908820-arrays-have-incompatible-sizes-for-this-operation

回答： Jan 2023-2-8

I am new to matlab coding. I wrote a code and I am getting this error "Arrays have incompatible sizes for this operation".

% here I define epx, esx and define polx as given below, which all Nr x ntheta x nphi dimension
epx = zeros(nr,ntheta,nphi);
esx = zeros(nr,ntheta,nphi);
polx = 3.0*(epx.^2.*conj(esx));
for ii = 1:nR
    for jj = 1:nTheta
        for kk = 1:nPhi 
            % the function handle funy is used to integrate f(r, theta, phi) over r, theta and phi using simp3v function below
            funy = @(r,theta,phi) -(ka^2/R(ii))*exp(1i*ka*R(ii)).*...
                exp(-1i*ka*R(ii).*r.*(sin(Phi(kk)).*sin(phi).*cos(Theta(jj)+theta)+...
                cos(Phi(kk)).*cos(phi))/R(ii)).*r.^2.*sin(theta).*cos(Theta(jj))*cos(Phi(kk)).*polx;
            eay(ii,jj,kk) = simp3v(funy,rmin,rmax,thetamin,thetamax,phimin,...
                phimax,nr);
        end
    end

so the error comes due to "polx". if i remove this in the function handle, then the code runs correctly, but with polx in the function handle, the code runs into error.

Any suggestions would be helpful as I am new to matlab.

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Dyuman Joshi 2023-2-8

Please copy-paste the full error message.

Jayachander Borker 2023-2-8

Arrays have incompatible sizes for this operation.

Error in CARS_2>@(r,theta,phi)-(ka^2/R(ii))*exp(1i*ka*R(ii)).*exp(-1i*ka*R(ii).*r.*(sin(Phi(kk)).*sin(phi).*cos(Theta(jj)+theta)+cos(Phi(kk)).*cos(phi))/R(ii)).*r.^2.*sin(theta).*cos(Theta(jj))*cos(Phi(kk)).*polx (line 188)

cos(Phi(kk)).*polx;

Error in simp3v (line 19)

S = feval(func,xx,yy,zz);

Error in CARS_2 (line 199)

eay(ii,jj,kk) = simp3v(funy,rmin,rmax,thetamin,thetamax,phimin,...

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Answer 1

Jan 2023-2-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1908820-arrays-have-incompatible-sizes-for-this-operation#answer_1166570

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If you use a normal function instead of an anonymous function, you can use the debugger easily.

function y = funy(r,theta,phi)
y = -(ka^2/R(ii))*exp(1i*ka*R(ii)).*...
    exp(-1i*ka*R(ii).*r.*(sin(Phi(kk)).*sin(phi).*cos(Theta(jj)+theta)+...
    cos(Phi(kk)).*cos(phi))/R(ii)).*r.^2.*sin(theta).*cos(Theta(jj))*cos(Phi(kk)).*polx;
end

Set a breakpoint in this function or let Matlab stop automatically by setting:

dbstop if error

Now run the code again until it stops. Check the dimensions of the used functions. Splitting the huge formula into parts would be useful also - and easier to read.