Matrix dimension must agree

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

[KALYAN ACHARJYA]

Please define all those parameters. R,ho,x3,sd1....etc

[David Hill]

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.

[Saskia Nur Santika]

f=15; R=2*f; ho=12; so=10; sia=-((f*so)/(f+so)) x3=-r-sia

Answer 1

[Adam Danz]

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))

[Saskia Nur Santika]

Thankyouu

[KALYAN ACHARJYA]

If your question is answered, you can accept the answer.

Answer 2

[Mateus Banroc]

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.

[Saskia Nur Santika]

Yeah, thankyou so much.