# Why do I get "Array indices must be positive integers or logical values" error?

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Arif Najmi on 30 Jan 2023
lc= 0.03
b=0.013
Rc= 0.0275
theta1= 0:15:360
theta2=theta1*pi/180
x=lc/2;
y=((Rc^2)*(theta2))
z=((b^2)*0.5)*(sin((theta1).*2))
r=b*(sin(theta1))
u1=Rc^2
u2=r.^2
u=r.*(((u1)-(u2)).^1/2)
rr=Rc^2*atan(r/u)
Vc=x(y+z-u-rr)
Why can't solve? Can someone help me?

Arif Hoq on 30 Jan 2023
try this:
lc= 0.03;
b=0.013;
Rc= 0.0275;
theta1= 0:15:360;
theta2=theta1*pi/180;
x=lc/2;
y=((Rc^2)*(theta2));
z=((b^2)*0.5)*(sin((theta1).*2));
r=b*(sin(theta1));
u1=Rc^2;
u2=r.^2;
u=r.*(((u1)-(u2)).^1/2);
rr=Rc^2*atan(r/u);
Vc=x*(y+z-u-rr)
Vc = 1×25
1.0e-04 * -0.1782 -0.1614 -0.1220 -0.0783 -0.0518 -0.0384 -0.0107 0.0362 0.0710 0.0868 0.1066 0.1463 0.1909 0.2132 0.2268 0.2592 0.3043 0.3381 0.3521 0.3732 0.4169 0.4576 0.4786 0.4937 0.5271

Askic V on 30 Jan 2023
Vc=x(y+z-u-rr)
here, x is considered an array and y+z-u-rr is an index. basically you're trying to access an element of the array throught its index. Indices should be positive integers or logical values and not numbers with decimal points.
So this is probably a typo and Arif corrected this line to be:
Vc=x*(y+z-u-rr)

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