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Unknown variable with str2num ?

5 次查看（过去 30 天）
SHARAD KUMAR UPADHYAY
回答： KSSV 2019-4-24
%% Sir I am using a matlab code but I got a error here I am showing the main file only and error
function sigmaDloop(sb)
b=str2num(sb);
lmat=[1 20; 21 29; 30 36; 37 42; 43 47; 48 51; 52 55; 56 58; 59 61];
l1=lmat(b,1);
l2=lmat(b,2);
maxNumCompThreads(1);
T=70;
dimpP=20e-9;
dimpA=10e-9;
hbar=1.054571800e-34;
vf=1.1e6;
kB=1.38064852e-23;
nimp=5e14; %nimp= 5 x 10^10 cm^-2.
dspacer=9e-9;
nA=[0:1:20 22:2:100]; %in units of 10^10 cm^-2.
nP=nA;
EF=hbar*vf*sqrt(pi.*nA.*1e14);
TF=EF./kB;
mutildeA=Fmu(T./TF).*EF./(kB.*T);
mutildeP=mutildeA;
sigmadrag=zeros(length(mutildeP),length(mutildeA));
kB=1.38064852e-23;
hbar=1.054571800e-34;
vf=1.1e6;
dspacertilde=kB.*T.*dspacer./(hbar.*vf);
save(['sigmadragvals' num2str(b) '.mat'],'T','nA','nP','mutildeA','mutildeP','sigmadrag','dspacertilde','EF','TF');
for j=l1:l2
for k=1:j
diary(['sigmaDs' num2str(b) '.txt']);
tic
sigmadrag(j,k)=sigmaDtilde2d(dspacertilde,mutildeA(k),mutildeP(j))
toc
save(['sigmadragvals' num2str(b) '.mat'],'T','nA','nP','mutildeA','mutildeP','sigmadrag','dspacertilde','EF','TF','-append');
diary off;
end
end
end
%% and now error as
sigmaDloop
sb =
1
Error using str2num (line 32)
Requires string or character array input.
Error in sigmaDloop (line 7)
b=str2num(sb);
%% please give suggestion of this
  1 个评论
Stephen23
Stephen23 2019-4-24
The input sb is numeric, not a string or a character vector. Thus the error.

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回答（1 个）

KSSV
KSSV 2019-4-24
Read about str2num. It takes string as input and conerts it to number. If the input is not string it will throw error like in your case.
str2num('2') % no error '2' is string
str2num(2) % error, 2 is number not a string
In your case, your input sb is not a string.

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