Undefined function or variable

muharrem çevik

2021 1 10

0 个回答

4 次查看（30 天）

0 个投票

I am getting this error even though I have defined the "mat" function in my code. "Undefined function or variable 'mat'." I did some research but I can't find the reason. Because the code is too long, I do not share it all, but I share the relevant part below. other parts of the code are working.

Thanks in advance for your answers.

counter=0;
converg=1;
while converg>0.01;
    for j = 2:n-1
        min = 1000;
        for l = 2:m-1
            if number(j,l)~=0 && number(j,l) < min
                min = number(j,l);
            end
        end
        for i = 2:m-1
            if index(j,i)~=0
               
                n2 = number(j,i);
                n1 = n2 - min +1;
                if n1 == 1
                    mat(n1,n1) = C(j,i);
                    mat(n1,n1+1) = E(j,i);
                    d(n1,1) = (-1) * (P(j-1,i) * N(j,i)+P(j+1,i)*S(j,i))+Q(j,i);
                end
                if n1 == max(number(j,:)) - min +1
                    mat(n1,n1) = C(j,i);
                    mat(n1,n1-1) = W(j,i);
                    d(n1,1) = (-1) * (P(j-1,i) * N(j,i)+P(j+1,i)*S(j,i))+Q(j,i);
                end
                if n1~=1 && n1 ~= max(number(j,:))-min+1
                    mat(n1,n1) = C(j,i);
                    mat(n1,n1-1) = W(j,i);
                    mat(n1,n1+1) = E(j,i);
                    d(n1,1) = (-1) * (P(j-1,i) * N(j,i)+P(j+1,i)*S(j,i))+Q(j,i);
                end
            end
        end
        
    Pwf = thm(mat,d);  
       
        for i = 2:m-1
            if index(j,i)~=0
                n2 = number(j,i);
                n1 = n2 - min +1;
                P(j,i) = Pwf(n1,1);
            end
        end
        clear Ps
        clear mat
        clear d
    end
   
    Pdiff = abs(Pold - P);
    converg = max(max(Pdiff));
    Pold = P;
    counter = counter + 1
end

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Walter Roberson 2021-1-10

在 MATLAB Online 中打开

min = number(j,l);

We recommend against using min or max as the names of variables, as it is very common to find that later in the same function one wants to use the min() or max() function. It also confuses readers, who would have to look carefully at the flow of code