Using Interpolating Function

Asked Apr 16 '19 at 13:47

Active Apr 16 '19 at 15:57

Viewed 38 times

I'm a bit of a noob with mathematica. I'm having a problem trying to use values from my solution. I've used ND solve to integrate ODEs. I have

sol = NDSolve[{
   u'[z] == uFunctionRhat,
   v'[z] == vFunctionRhat,
   w'[z] == wFunctionThat,
   y'[z] == yFunctionThat,
   uCond == 0,
   vCond == 0,
   wCond == 0,
   yCond == 1}, {u, v, w, y},
  {z, L, 0}]

where I can plot u,v,w,y easily.

My question is, HOW do I say find the value of u[z=0] ?

If I put u[0] it just returns the text. Thanks in advance.

edited Apr 16 '19 at 15:57

user64494

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asked Apr 16 '19 at 13:47

rami_salazar

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Try u[0] /. sol – Coolwater Apr 16 '19 at 13:56
Perfect thank you! – rami_salazar Apr 16 '19 at 14:08
Or u[0] /. sol[[1]] to remove the outer list between the { and } . – Chris K Apr 16 '19 at 14:18
1

Possible duplicate of What are the most common pitfalls awaiting new users? In particular this post. – Henrik Schumacher Apr 16 '19 at 18:43

Using Interpolating Function

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