Getting single answer for function with an array

2 次查看（过去 30 天）
Takura Nyatsuro
Takura Nyatsuro 2022-4-16
编辑： Torsten 2022-4-16
Hi there,
Im trying to plot a graph of Drag against velocity. The velocity(V) in which is stored in an array from 20 to 100 in increments of 10. however when i calculate drag (D) the code only outputs a single output for drag instead of one output for each velocity.
Any help would be appreciated ,
Thank you
>> d=1.225;
>> S=50;
>> Cd=0.03;
>> K=0.04;
>> W=50;
>> V=[20:10:100];
>> D=((0.5)*d*(V.^2)*S*Cd+(K*W^2))/((0.5*d*(V.^2)*S))

请先登录，再回答此问题。

回答（1 个）

Torsten
Torsten 2022-4-16
D=(0.5*d*V.^2*S*Cd+K*W^2)./(0.5*d*V.^2*S)
instead of
D=((0.5)*d*(V.^2)*S*Cd+(K*W^2))/((0.5*d*(V.^2)*S))
  3 个评论
显示 1更早的评论
Voss
Voss 2022-4-16
编辑：Voss 2022-4-16
Ran in:
./ is element-wise division:
[2 4 6 8]./[2 3 4 5] % = [2/2 4/3 6/4 8/5]
ans = 1×4
1.0000 1.3333 1.5000 1.6000
/ is matrix division:
[2 4 6 8]/[2 3 4 5]
ans = 1.4815
More information: https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html
Torsten
Torsten 2022-4-16
编辑：Torsten 2022-4-16
@Takura Nyatsuro
Since you already used elementwise multiplication for V, I didn't explain in detail what was the reason for the error. I thought it was only an oversight.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Logical 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