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how to implement cartesian coordinates

Asked by kash on 29 Mar 2013

I have a image

http://imgur.com/EOyLRe6

which consists of cartesian coordinates,plz tell how to implement these coordinates,which function must be used

Kindly help

Walter Roberson on 29 Mar 2013

What is the context for that? It does not appear to be general Cartesian coordinates: it appears to be the expression in Cartesian coordinates of something like a wave function or a rotation.

kash on 29 Mar 2013

it is equation taken from

http://en.wikipedia.org/wiki/Navier%E2%80%93Stokes_equations

which is Navier–Stokes equations

kash on 29 Mar 2013

its for fluid flow

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Answer by Walter Roberson on 29 Mar 2013

Use the symbolic toolbox function diff()

Walter Roberson on 29 Mar 2013

8 is correct. f = x^3, and 2^3 is 8.

kash on 3 Apr 2013

after differentation we get 3x^2,so the answer should be 12 rite

Walter Roberson on 3 Apr 2013

No, the answer for a=subs(f,[x],2) should be 8. Calculating diff(f) makes no difference to the value you find by substituting something into f.