getting wrong values when coding

Hello,

    There may be something wrong of my code that the outcome seems peculiar.
    Here is my code.

>> [x,y]=meshgrid(0:0.02:1,0:1:0);

>> u=0*x;

>> v=4*(1*x-(x.^2));

>> quiver(x,y,u,v);

    I just want to do vector analysis, and the outcome of v is the same as my expectation; that is,

v =

Columns 1 through 14

         0    0.0784    0.1536    0.2256    0.2944    0.3600    0.4224    0.4816    0.5376    0.5904    0.6400    0.6864    0.7296    0.7696

Columns 15 through 28

    0.8064    0.8400    0.8704    0.8976    0.9216    0.9424    0.9600    0.9744    0.9856    0.9936    0.9984    _1.0000_    0.9984    0.9936

Columns 29 through 42

    0.9856    0.9744    0.9600    0.9424    0.9216    0.8976    0.8704    0.8400    0.8064    0.7696    0.7296    0.6864    0.6400    0.5904

Columns 43 through 51

    0.5376    0.4816    0.4224    0.3600    0.2944    0.2256    0.1536    0.0784         0
======================================================================================
    The maximum of v is obviously one. But after graphing(quiver function), it doesn't equal to one. And I just want to know which part of my code is wrong.

Thanks.

Answer 1

[Mischa Kim]

Guan-Yu, use instead

 scale = 0;
 quiver(x,y,u,v,scale)

This turns off the automatic scaling of the arrows.