Array indices must be positive integers or logical values error

1 次查看（过去 30 天）
Haren Sunil Panchal
评论： Haren Sunil Panchal 2021-2-17
%HW4 Q2-Vector Loop solution
r2=1; r3=4;
theta2=60;
X = (2*r2((cosd(0)*cosd(theta2))));
B=r2^2-r3^2;
%Case 1 - signma=+1
sigma=1;
r1=(-(-X)+sigma*sqrt(X^2-4*B))/2;
theta3=atand((-r2*sind(theta2))/r1*cosd(0)-r2*cosd(theta2));
%Case 2 - sigma=-1
sigma=-1;
r1=(-(-X)+sigma*sqrt(X^2-4*B))/2;
theta3(2)=atand((-r2*sind(theta2))/r1*cosd(0)-r2*cosd(theta2));
The error is on line 4 for 'X' variable
  2 个评论
the cyclist
the cyclist 2021-2-17
FYI, I edited your question to use the "code" format from the toolbar, to make it more readable. Next time, please take a look at doing that yourself.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

the cyclist
the cyclist 2021-2-17
编辑：the cyclist 2021-2-17
You need
X = (2*r2*((cosd(0)*cosd(theta2))));
instead of
X = (2*r2((cosd(0)*cosd(theta2))));
(Note that I used r2* instead of just r2.)
MATLAB needs the explicit multiplication sign there, to distinguish the syntax from indexing a variable (which is why it threw that error).

类别

在 Help Center 和 File Exchange 中查找有关 MATLAB 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by