Help with function main and writing cross product function
4 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Kommentiert: CalamityGoat am 27 Apr. 2015
So I am trying to write a function to calculate the cross product of any two vectors. I am trying to write the code to work with some test vectors I have defined both vectors as 2 dimensional for my test but in eventuality I will want the code to accept either 2 dimensional or 3 dimensional vectors. So far I have:
% vectors a = 3i + 11j; b = 14i - 7.3j;
a = [3 11]; b = [14 -7.3];
vec_c = crosspro(a, b)
function w = crosspro(u, v)
% crosspro calculates the crossproduct of u cross v
if length(u) == 2
u = [u 0 ];
if length(v) == 2
v = [v 0 ];
i = (u(2)*v(3)-u(3)*v(2));
j = (u(3)*v(1)-u(1)*v(3));
k = (u(1)*v(2)-u(2)*v(1));
result=[i j k];
I get an error if length(u) == 2, I was given them as a hint based on the code I had previously. Also it says output "w" (and maybe others) are not assigned during call main>crosspro.
Can someone help explain what is going on here and also how to fix my code to work from here? Thanks a bunch!
Michael Haderlein am 27 Apr. 2015
You have to decide if you want to name the output argument "w" or "result". If you change your second last line to
w=[i j k];
things will work. Just as a comment, if you want to make sure that also column vectors work, replace
The same with v of course. Also, I guess this is for educational purpose only - you know the function "cross", don't you?
Weitere Antworten (0)
Find more on Linear Prediction in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!Start Hunting!