Please help me understand the use of dot operator
585 ビュー (過去 30 日間)
古いコメントを表示
Hello. I have been having this same problem in a lot of the homework assignments I have been given so far.
What I am trying to do is use the while loop to create values for J, and in the same loop I am trying to use those values of
J to create a new array with the values from tau.
clc; clear ; clear all
F = 10; %Newtons
T = F*0.1 ; %Work
r = 0:5; %mm
i = 1
while i < 6
J = (.5*pi)*r.^4
tau(i) = (T*r)/J
i = i + 1;
end
2 件のコメント
採用された回答
Star Strider
2020 年 2 月 18 日
The dot operator, used with multiplication, division, and exponentiation, creates element-wise oiperations. See Array vs. Matrix Operations for a full explanation.
The one exception to that is the use of the dot operator in creating matrix transposes. The ‘regular’ matrix transpose (') creates the complex-conjugate transpose of a complex vector or matrix. Using the (.') creates the transpose without doing the complex-conjugate operation.
3 件のコメント
その他の回答 (1 件)
David Hill
2020 年 2 月 18 日
Not sure what you want tau to be. Currently you have an array (T*r) divided by another array (J). If you want to generate a tau matrix, then:
tau(i,:)=(T*r)./J;
If tau is suppose to be a 6 element array, then I suppect what you meant was:
F = 10; %Newtons
T = F*0.1 ; %Work
r = 0:5; %mm
J = (.5*pi)*r.^4;
tau = (T*r)./J;%need ./for element-wise operations
参考
カテゴリ
Help Center および File Exchange で Loops and Conditional Statements についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!