how to implement cartesian coordinates

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kash 2013-3-29

I have a image

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

Kindly help

kash 2013-3-29

it is equation taken from

which is Navier–Stokes equations

kash 2013-3-29

its for fluid flow

Walter Roberson 2013-3-29

Use the symbolic toolbox function diff()

kash 2013-4-3

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

Walter Roberson 2013-4-3

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.

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