MATLAB: How to calculate the length of a vector, if x and y of a vector are both in formula form


Here is the requirement for coding, first line of coding is the range of x and y, vecyx is dL/dx, vecy is dL/dy. Those are provided by the requriement.
Then following the requirement's description. I used V=[ ] ; length(v) to calculate the length, but it just come up one result. But according to the description, the reulst should be an array. So how do i code it? Many thanks!!!!!!
for ask.png
[x,y]=meshgrid(0:0.01:50, 0:0.01:30);
V=[vecx vecy];

Best Answer

  • The v is a vector, and the question wants the length of v but not in elements, but in real world units. For example if my vx was [1,2] and my vy was [1,2] then my length in elements would be 2 because length(vx) = 2, however my length of my x is sqrt(2) - the length of the vector going from (1,1) to (2,2). So what you need to do to compute the length along your v vector is summing along all the delta v from one element to the next. See if you can use diff() and sqrt() and sum() to do that.