Trouble with Matrix Dimensions

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Patrick
Patrick on 20 Nov 2013
Commented: Patrick on 21 Nov 2013
I am trying to simulate the kinematics of a crank slider in matlab. I have obtained a function which I believe to be correct, however matlab gives me this error:
>> velx = -r*sin(a) - L*(asin((r/L)*sin(a)))*(acos(((r/L)*sin(a))*((r/L)*sin(a))))
Error using *
Inner matrix dimensions must agree.
The variable 'a' is a 1x100 matrix generated via the linspace command. r and L are simply 1x1 single digit numbers. How can I get around this error? I want to plot the output of velx vs 'a' to obtain a graph.
It works if 'a' is just a 1x1 number, but doing it this way would require me to manually type in the values for 'a' 100 times and this would be tedious. I think perhaps there is a way to do it with a for loop command?
If anyone could help it would be much appreciated.

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 20 Nov 2013
Edited: Azzi Abdelmalek on 20 Nov 2013
Use operation element by element .*
velx = -r*sin(a) - L*(asin((r/L)*sin(a))).*(acos(((r/L)*sin(a)).*((r/L)*sin(a))))

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