Matrix dimension must agree
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Saskia Nur Santika
on 9 Jan 2020
Commented: Saskia Nur Santika
on 9 Jan 2020
Ihave a code
xd=-(sqrt(R²-ho²)):0.5:x3;
xd1=x3;
yd1=y3;
xd2=-(sqrt(R²-ho²));
yd2=ho;
yd=(((xd-xd1)./(xd2-xd1)).*(yd2-yd1))+(yd1);
plot(xd,yd,'k')
The result is:
Eror using .* Matrix dimensions must agree.
Please help mee ?
*code formatted by Adam Danz; the squared superscripts are ambiguous (^2 or .^2) so I left them as-is - AD
3 Comments
David Hill
on 9 Jan 2020
You need to provide more information. Look at the size of each of your matrixes. If you want help you will need to provide examples of your variables.
Accepted Answer
Adam Danz
on 9 Jan 2020
In this line
yd = (((xd-xd1)./(xd2-xd1)).*(yd2-yd1))+(yd1);
% ^^
The terms to the left and right of .* are not the same size. The dot-asterisk notation specifies element-wise multiplication where x .* y is interpretted as x(i) * y(i). That requires that x and y are the same size.
The two lines below must produce the same output.
size(((xd-xd1)./(xd2-xd1)))
size((yd2-yd1))
2 Comments
More Answers (1)
Mateus Banroc
on 9 Jan 2020
Hi Saskia,
In your code, I guess that only xd and yd are vectors, right? So x3, y3, R and ho should be scalars.
I don't know what are the values of these scalars but I tried this and it worked.
R=10; ho=2;
x3=10;
y3=10;
xd=-(sqrt(R^2-ho^2)):0.5:x3;
xd1=x3;
yd1=y3;
xd2=-(sqrt(R^2-ho^2));
yd2=ho;
yd=(((xd-xd1)./(xd2-xd1)).*(yd2-yd1))+(yd1);
plot(xd,yd,'k')
You must check if R, ho, x3, y3 are scalars.
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