Array indices must be positive integers or logical values.

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Jocelyn
Jocelyn on 13 Nov 2020
Edited: Cris LaPierre on 13 Nov 2020
Hello,
My code below is displaying the following error message:
"Array indices must be positive integers or logical values.
Error in Assign5_Prob7 (line 38)
phi(i) = atand(tan(phi_o)+((g*t(i))/Vx_o)*((1/3)*((Vx_o/Vx(i)+ sqrt((Vx_o/Vx(i)))+1)))); "
I don't see anything resulting in a zero within the equation. I'm not sure why this error is displaying. Thank you.
Vy_o = 0.00001;
Vx_o = 2296;
phi_o = atand(Vx_o/Vy_o);
for i = 1:6
x(i) = (i-1)*200*3;
y(i) = (i-1)*200*3;
Vx(i) = (sqrt(Vx_o) - ((k3/2)*x(i)))^2;
t(i) = (x(i)/Vx_o)*sqrt(Vx_o/Vx(i));
phi(i) = atand(tan(phi_o)+((g*t(i))/Vx_o)*((1/3)*((Vx_o/Vx(i)+ sqrt((Vx_o/Vx(i)))+1))));

Accepted Answer

Cris LaPierre
Cris LaPierre on 13 Nov 2020
This error means that your index variable i is either
  • negative
  • zero
  • not an integer
Check your code that you did not include and see if you modify the value of i somewhere before getting to line 38.
  3 Comments
Cris LaPierre
Cris LaPierre on 13 Nov 2020
The line below 38 will not cause an error to appear in line 38.
Try sharing all 38 lines of your code, rather than just the one or two around the error. If you want, you can attach your script using the paperclip icon.

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