matlab - Meshgrid stretching surface plot -

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i have been trying add axis surf plot have. i've tried various suggestions can't work. have 3 matrices:

final -> 3460x300 double

spec -> 1x300 double (x-axis)

timedate -> 1x3460 double (y-axis)

the timedate matrix values converted time , dates date2num.

i tried

plot = surf(final); set(plot,'linestyle','none');

which gives me correct graph axis wrong. see image: enter image description here

when try

[xx,yy] = meshgrid(spec,timedate) plot2 = surf(xx,yy,final); set(plot,'linestyle','none');

it gives me correct axis graph seems stretched enter image description here

how solve this?

thanks in advance

the second graph seems correct, first 1 assumes fixed distance between samples , second 1 uses complete info (x, y , z axis), below simplification of problem:

let's want graph curve described points (0.5, 1), (1, 2), (1.5, 3), (2, 4), correct way of doing is:

x = [0.5, 1, 1.5, 2]; y = [1, 2, 3, 4]; plot(x, y)

but doing: 

plot(y)

both graphs show same curve (because points sampled fixed distance in x axis) points scaled , displaced along x axis.

but, if points (0.5, 1), (1.2, 2), (1.4, 3), (2.2, 4)?:

plot(x,y) , plot(y) show different curves because points not sampled fixed distance along x axis, that's happens in problem.


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