Pick a specific level in the contour plot on matlab -

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i have plot generated test of figuring out how contour plots work on matlab in general. i'm trying figure out if there way can plot 1 of lines not first line.

they way matlab explains if do:

 contour(x,y,z,1);

it plot 1 of lines it's first one, particular case want 3rd or 4th one. there way in matlab?

contour(z,n) , contour(x,y,z,n) draw n contour lines, choosing levels automatically. not want!

contour(z,v) , contour(x,y,z,v) draw contour line each level specified in vector v. use contour(z,[v v]) or contour(x,y,z,[v v]) draw contours single level v.

suggesting levels of 3rd , 4th line 7 , 8 have write contour(x,y,z,[7 7]) plot 3rd line or contour(x,y,z,[7 8]) plot 3rd , 4th line.


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