Please help me understand the use of dot operator
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Tsansoterra
il 18 Feb 2020
Commentato: Star Strider
il 18 Feb 2020
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
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Star Strider
il 18 Feb 2020
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.
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David Hill
il 18 Feb 2020
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
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