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i keep getting the error "Error using -""Matrix dimensions must agree"
for this piece of code. Can anybody help me and identify where i'm going wrong? I should be getting 8 plots of f vs d.
P=500;
N=1:1:8;
a=-0.4;
b=-1;
Kd=700;
d50star=(1./(10.^(Kd*(N.^a)*(P-115).^b)))
w0=0.45;
d=0:0.1:10
d50N0=5;
if d50star < 0.33;
w=(1-(2.3*d50star))*w0
else
w=(3.4-(5.5*d50star))*w0
end
d50=(1-d50star)*d50N0;
f=1-(1./((1+exp((d-d50)/w))))
There are at least two errors in the script:
1) in the last line [f=1-(1./((1+exp((d-d50)/w))))]
d size is 1x101
d50 size is 1x8
The size inconsistency is related to the definition of:
N=1:1:8; and
d=0:0.1:10
2) depending on the algoroth, it could be ./w instead of /w
Hope this helps.
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I need help with my Matlab code. It is not working, it keeps giving me errors on the same line. I don't know how to fix it, can you please help? I am trying to make graphs in Matlab.
clc
num=(1);
dem=[1 3 10 0];
Ls=tf(num,dem);
relocus(Ls)
The error is:
Error in Matlab (line 4)
Ls=tf(num,dem);
Correct the function 'relocus' to 'rlocus'.
num=(1);
dem=[1 3 10 0];
Ls=tf(num,dem);
rlocus(Ls)
clc
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I have an array of structs. Every struct holds a set of data for one single measure. Matlab gives me an error when I try to plot this data.
Expected one output from a curly brace or dot indexing expression, but there were 361 results.
How should I rewrite my plot code?
plot(result.structArray_A(:).nonArrayValue_X, result.structArray_A(:).nonArrayValue_Y);
I have found a solution. Simply writing the following does work, even if the syntax does look odd:
plot([result.structArray_A.nonArrayValue_X], [result.structArray_A.nonArrayValue_Y]);
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For matalb there's an error at line 9, where I define dy(1), but it doesn't say what kind of error.
function dy=pred_prey(t,y)
k=1;
a=2/3;
d=4/3;
f=#(x)cos(x.^2)
r=#(t)integral(f,0,t);
mu=#(t)13/20-(3/5)*exp(-(3/t));
dy(1)=(y(1)+k)*r-a*y(1)*y(2);
dy(2)=-mu*y(2)+d*y(1)*y(2);
dy=dy';
You define r as an anonymous function, but you don't pass any arguments to it when you call it on line 9. The line should be (I assume):
dy(1) = (y(1)+k)*r(t)-a*y(1)*y(2);
Incidentally, you're going to have the same problem on the next line where you call mu with no arguments as well.
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Closed 8 years ago.
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I have tried the code from the link Ear Image Processing - Finding the point of intersection of line and curve in MATLAB
but seem to get an error as dist2s is undefined on matlab R2013a.Can anyone help me out
That's because you need to create the function (isn't defined by MatLab itself). Try saving this code in a file called dist2s.m and then setting the folder where it's located like current folder:
function out = dist2s(pt1,pt2)
out = NaN(size(pt1,1),size(pt2,1));
for m = 1:size(pt1,1)
for n = 1:size(pt2,1)
if(m~=n)
out(m,n) = sqrt( (pt1(m,1)-pt2(n,1)).^2 + (pt1(m,2)-pt2(n,2)).^2 );
end
end
end
return;
The code is provided in the same answer you refer to.
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I'm using the computer vision: VLfeat library to compute a HOG descriptor of an image, and after inputing this code:
cellSize = 8 ;
hog = vl_hog(im, cellSize, 'verbose') ;
I get this error in MATLAB, and when I google it I really can't find any possible explanation:
Error using vl_hog
I is not a real numeric array of class SINGLE.
After going over the code (found here) I'm also not sure what the variable I is:
Hopefully, I haven't missed something elementary ...
library source
As the asker already found out, the I refers to the first input argument.
Hence this should solve the problem:
hog = vl_hog(single(im), cellSize, 'verbose')