# Z must be a matrix, not a scalar or vector error while using surf function.

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Swathi S on 21 Aug 2019
Answered: KALYAN ACHARJYA on 21 Aug 2019
'Mtotal' should be calculated for 'a' and 'wd' each with 5values. Means 'Mtotal' should be a 5X5 matrix. But the loops comes to an end for single value of 'a' and 'wd' so am getting a single value for 'Mtotal' instead of getting a 5x5 matrix. Please correct me where I went wrong.
CODE:
clear all;
close all;
x=0
y=0
u0=4*pi*(10^-7);
f=5*10^6;
w=2*pi*f;
u=4*pi*(10^-7);
U=2;
N=5
Li=zeros(1,N)
L0=zeros(5,5)
M=zeros(1,N*N)
Mt1=zeros(5,5)
Mtotal=zeros(5,5)
a=0.1:0.05:0.3
for i=1:5
wd=0.007:0.001:0.011
for j=1:5
r0=[0.0004066 0.0003224 0.0002557 0.0002028 0.0001608]
d=1
s=0.001
e=7*(8.854*10^-12)
sig=0.11
alpha=3.9*10^-3
T=26
T0=33
dout=2.*a(i)
d1=sqrt(2).*a(i)
aw=wd(j)./2
din=dout-(2.*N.*wd(j))-(2.*(N-2).*s)
davg=(dout-din)./(dout+din)
ltc=4.*N.*(dout-(N-1).*(wd(j)+s))
Aw=pi.*(aw.^2)
R=(r0.*ltc.*(1+alpha.*(T-T0)))./Aw
theta=90
J=2.*sin(theta).*sin(theta)+cos(theta).*cos(theta)
sd=(w.*(sqrt((u.*e./2).*(sqrt(1+(sig./(w.*e)).^2)-1)))).^(-1)
G=exp(-d/sd)
Li=zeros(1,N)
ai=a(i)-2.*(N-1).*wd(j)-2.*(N-1).*s:2.*(wd(j)+s):a(i)-2.*(N-N).*wd(j)-2.*(N-N).*s
for k = 1:N
Ni=(u0./pi).*((ai(k).*log((2.*ai(k).*ai(k))./(ai(k)+d1)))+(ai(k).*log((2.*ai(k).*ai(k))./(ai(k)+d1)))+(2.*(d1-ai(k)-ai(k))))
Gi=((u0.*ltc)./(2.*pi)).*(log(aw)-0.12)
Li(k)=Ni-Gi
L0(i,j)=sum(Li)
end
r1=@(bi,bj) sqrt((x+bi).^2+(y+bj).^2+d.^2)
r2=@(bi,bj) sqrt((bi-x).^2+(y+bj).^2+d.^2)
r3=@(bi,bj) sqrt((bi-x).^2+(y-bj).^2+d.^2)
r4=@(bi,bj) sqrt((x+bi).^2+(y-bj).^2+d.^2)
C1=@(bi) bi+x
C4=@(bi) -bi-x
C2=@(bi) bi-x
C3=@(bi) -bi+x
d1=@(bj) y+bj
d2=@(bj) y+bj
d3=@(bj) y-bj
d4=@(bj) y-bj
Bz= @(bi,bj) ((u0./(4.*pi)).*((((((-1).^1).*d1(bj))./(r1(bi,bj).*(r1(bi,bj)+((-1).^(1+1)).*C1(bi))))-(C1(bi)./(r1(bi,bj).*(r1(bi,bj)+d1(bj)))))+(((((-1).^2).*d2(bj))./(r2(bi,bj).*(r2(bi,bj)+(((-1).^(2+1))).*C2(bi))))-(C2(bi)./(r2(bi,bj).*(r2(bi,bj)+d2(bj)))))+(((((-1).^3).*d3(bj))./(r3(bi,bj).*(r3(bi,bj)+(((-1).^(3+1))).*C3(bi))))-(C3(bi)./(r3(bi,bj).*(r3(bi,bj)+d3(bj)))))+(((((-1).^4).*d4(bj))./(r4(bi,bj).*(r4(bi,bj)+((-1).^(4+1)).*C4(bi))))-(C4(bi)./(r4(bi,bj).*(r4(bi,bj)+d4(bj)))))))
bi=a(i)-2.*(N-1).*wd(j)-2.*(N-1).*s:2.*(wd(j)+s):a(i)-2.*(N-N).*wd(j)-2.*(N-N).*s
for l=1:N
bj=a(i)-2.*(N-1).*wd(j)-2.*(N-1).*s:2.*(wd(j)+s):a(i)-2.*(N-N).*wd(j)-2.*(N-N).*s
for m=1:N
M(l,m)=integral2(Bz,0,bi(l),0,bj(m))
Mt1=sum(M(l,m))
Mtotal=(Mt1(l,m)).*J.*G
surf(a(i),wd(j),Mtotal(l,m));
end
end
end
end
ERROR:
Error using surf (line 71)
Z must be a matrix, not a scalar or vector.
Error in FPSSCopti3DM2 (line 116)
surf(a(i),wd(j),Mtotal(l,m));
##### 2 CommentsShow 1 older commentHide 1 older comment
Swathi S on 21 Aug 2019
Sir, that did not work. 'Mt1' should be a 5x5 matrix which will make 'Mtotal' also 5x5, thus the matrix of the inputs and output will eventually match. The problem is the loop comes to an end for a single set of value execuation (a and wd) not for 5 set values. Thats why only one value is returned in 'Mt1' which is causing the error. I dont know why the loop is not executed fully instead it stops after 1 set of values. Can you help me rectify?

KALYAN ACHARJYA on 21 Aug 2019
clc;
clear all;
close all;
x=0
y=0
u0=4*pi*(10^-7);
f=5*10^6;
w=2*pi*f;
u=4*pi*(10^-7);
U=2;
N=5
Li=zeros(1,N)
L0=zeros(5,5)
M=zeros(1,N*N)
Mt1=zeros(5,5)
Mtotal=zeros(5,5)
a=0.1:0.05:0.3
for i=1:5
wd=0.007:0.001:0.011
for j=1:5
r0=[0.0004066 0.0003224 0.0002557 0.0002028 0.0001608]
d=1
s=0.001
e=7*(8.854*10^-12)
sig=0.11
alpha=3.9*10^-3
T=26
T0=33
dout=2.*a(i)
d1=sqrt(2).*a(i)
aw=wd(j)./2
din=dout-(2.*N.*wd(j))-(2.*(N-2).*s)
davg=(dout-din)./(dout+din)
ltc=4.*N.*(dout-(N-1).*(wd(j)+s))
Aw=pi.*(aw.^2)
R=(r0.*ltc.*(1+alpha.*(T-T0)))./Aw
theta=90
J=2.*sin(theta).*sin(theta)+cos(theta).*cos(theta)
sd=(w.*(sqrt((u.*e./2).*(sqrt(1+(sig./(w.*e)).^2)-1)))).^(-1)
G=exp(-d/sd)
Li=zeros(1,N)
ai=a(i)-2.*(N-1).*wd(j)-2.*(N-1).*s:2.*(wd(j)+s):a(i)-2.*(N-N).*wd(j)-2.*(N-N).*s
for k = 1:N
Ni=(u0./pi).*((ai(k).*log((2.*ai(k).*ai(k))./(ai(k)+d1)))+(ai(k).*log((2.*ai(k).*ai(k))./(ai(k)+d1)))+(2.*(d1-ai(k)-ai(k))))
Gi=((u0.*ltc)./(2.*pi)).*(log(aw)-0.12)
Li(k)=Ni-Gi
L0(i,j)=sum(Li)
end
r1=@(bi,bj) sqrt((x+bi).^2+(y+bj).^2+d.^2)
r2=@(bi,bj) sqrt((bi-x).^2+(y+bj).^2+d.^2)
r3=@(bi,bj) sqrt((bi-x).^2+(y-bj).^2+d.^2)
r4=@(bi,bj) sqrt((x+bi).^2+(y-bj).^2+d.^2)
C1=@(bi) bi+x
C4=@(bi) -bi-x
C2=@(bi) bi-x
C3=@(bi) -bi+x
d1=@(bj) y+bj
d2=@(bj) y+bj
d3=@(bj) y-bj
d4=@(bj) y-bj
Bz= @(bi,bj) ((u0./(4.*pi)).*((((((-1).^1).*d1(bj))./(r1(bi,bj).*(r1(bi,bj)+((-1).^(1+1)).*C1(bi))))-(C1(bi)./(r1(bi,bj).*(r1(bi,bj)+d1(bj)))))+(((((-1).^2).*d2(bj))./(r2(bi,bj).*(r2(bi,bj)+(((-1).^(2+1))).*C2(bi))))-(C2(bi)./(r2(bi,bj).*(r2(bi,bj)+d2(bj)))))+(((((-1).^3).*d3(bj))./(r3(bi,bj).*(r3(bi,bj)+(((-1).^(3+1))).*C3(bi))))-(C3(bi)./(r3(bi,bj).*(r3(bi,bj)+d3(bj)))))+(((((-1).^4).*d4(bj))./(r4(bi,bj).*(r4(bi,bj)+((-1).^(4+1)).*C4(bi))))-(C4(bi)./(r4(bi,bj).*(r4(bi,bj)+d4(bj)))))))
bi=a(i)-2.*(N-1).*wd(j)-2.*(N-1).*s:2.*(wd(j)+s):a(i)-2.*(N-N).*wd(j)-2.*(N-N).*s
for l=1:N
bj=a(i)-2.*(N-1).*wd(j)-2.*(N-1).*s:2.*(wd(j)+s):a(i)-2.*(N-N).*wd(j)-2.*(N-N).*s
for m=1:N
M(l,m)=integral2(Bz,0,bi(l),0,bj(m))
Mt1=sum(M(l,m))
Mtotal(k)=Mt1*J*G
%surf(a(i),wd(j),Mtotal(l,m));
end
end
end
end
surf(a,wd,Mtotal);
Still you have to correctify to get the correct results