Undefined function or variable

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muharrem çevik
muharrem çevik 2021-1-10
评论： muharrem çevik 2021-1-11
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
  5 个评论
显示 3更早的评论
Walter Roberson
Walter Roberson 2021-1-10
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

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