Help with for loop and invalid expression
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Hi, I'm currently stuck on this loop and I'm getting an inalid expression error at the moment. Would be greatful if someone could help me resolve it please.
m=458
n= 2
t = 30
for i=1:m
for j=1:n
x = 1.4*sin(t^1.6) + 0.3*tan(t^1.3)
t = t+0.01
a(i,j)=(t,x) %this is where the first error occurs
end
end
a=reshape(a,m,n)
figure
hold on
plot(a,Linespace)
title('Displacement vs time')
v = reshape(a,m,n);
b = reshape(a.m.n)
for i in x:
if(x(1,i) >20)
v = x(1,i)
else
b = x(1,i)
end
end
figure
hold on
plot(v,Linespace,'g')
plot(b,Linespace,'r')
title('Displacement vs time')
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Antworten (1)
Dave B
am 6 Aug. 2021
The line of code
a(i,j)=(t,x);
doesn't make sense. a(i,j) is a location in a matrix, namely the ith row and jth column of the matrix a. You can only store one value there. So you can do:
a(i,j) = t;
or
a(i,j) = x;
or even
a(i,j,1:2)=[1 2]; % if a was a 3 dimensional matrix
My guess is leave the t out of the loop, it looks like it's something like:
t = 0:.01:(numel(a)-1)*.01;
Once you've done that, you'll realize you can probably leave the assignment of the loop:
a = 1.4.*sin(t.^1.6) + 0.3.*tan(t.^1.3);
% but I'll leave it to you to figure out how big t should be without
% relying on numel(a). It's pretty simple!
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