how can i write this lissajous function in matlab????
Asked by mari gaji on 7 Aug 2012
Latest activity Commented on by Walter Roberson on 9 Aug 2012
hi all
I knew that my question is so silly, but I am new I matlab area and I need help:
I have this lissajous function:
x (t)=Asin(at+d) y (t)=Bsin(bt)
where t = from 0 to 2pi, what I need is to know how I can write this function in an m-file which take three scalars a, b, and d , and a vector t as its arguments and returns two vectors x(t) and y (t) also A=B=1
thanks for any one help
mari
regards
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2 Answers
Answer by Andrei Bobrov on 8 Aug 2012
Edited by Andrei Bobrov on 8 Aug 2012
Accepted answer
your_lissajous = @(t,a,b,d)[sin(a*t(:)+d), sin(b*t(:))];
eg of use function your_lissajous
xy = your_lissajous(0:pi/100:2*pi,7,8,0); plot(xy(:,1),xy(:,2))
2 Comments
mari gaji on 9 Aug 2012
hi Andrei and thanks: but there is an error in this cod (??? Undefined function or method 'your_lissajous' for input arguments of type 'double'.) this is what result in matlab
Walter Roberson on 9 Aug 2012
With the (valid) definition that Andrei gave, you would only be able to invoke "your_lissajous" from within a function that had the assignment statement given. If you need to define it for use in all routines, you will need to store the following in your_lissajous.m
function xy = your_lissajous(t, a, b, d) xy = [sin(a*t(:)+d), sin(b*t(:))]; end
Answer by Walter Roberson on 8 Aug 2012
The function heading would be
function [x, y] = my_lissajous(a, b, d, t)
2 Comments
mari gaji on 8 Aug 2012
thank alot Walter but there is another question please, when i writ downe the cod and try to run it there was an error which indicate that the value of A is undefinde eventhough i had writ it?????
Walter Roberson on 9 Aug 2012
Remember that MATLAB is case sensitive, so "A" is not the same as "a". It does not matter which of the two you use, but you must be consistent.
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