Recent content by Sue Laplace

Hi, Thank you for the reply. The thing is, this seems only to work when you have actually got the formula F(x,t) which I don't, I only have a set of data telling me what F is for a certain number of x and t, hence I want to do the curve fitting. So, F is a two dimensional matrix. I am able to...

I am dealing with a set of data where I have values C(x,t) for a discrete set of x and t values. Say: x={1,5} t={1,3,7} C={{C(1,1),C(1,3),C(1,7)},{C(5,1),C(5,3),C(5,7)}}. How do I combine this to a list that looks like...

Thank you very much Bill, it is working.

After conducting my experimental work I will have a number of sets of data. It is easy to use Mathematica to find a fit of just one set, but I would like to fit all sets at once as they are too many to do them all ate once. They will all be fitted by the same function say y=ax+b, every set...

Hello! I am trying to solve the following second order PDE (copy that into mathematica): \!\( \*SubscriptBox[\(\[PartialD]\), \(x, t\)]\(\[Delta][x, t]\)\) + b \!\( \*SubscriptBox[\(\[PartialD]\), \(t\)]\(\[Delta][x, t]\)\) + a \!\( \*SubscriptBox[\(\[PartialD]\), \(\(x\)\(\...

Thank you both! I suppose indeed with a singular point it is difficult to talk about an average value. It is indeed at [0,0]. Why do you divide the integral by NIntegrate[1,{x,-1.5,0,1.5},{y,-0.5,0,0.5}]? I suppose you’re right as you both obtain an average value of 1..

NIntegrate indeed does give me an answer, though I get two errors, NIntegrate::slwcon: and NIntegrate::ncvb: so apperently my function is not well behaved. So I do not think I can use the result as I keep getting the ncvb error also for large nr of recursion.. I don't know how interested you...

Thanks for the reply! However, I'm afraid my function is too large for integrating, it just doesn't stop running..

Dear all, I wonder if there is a function implemented in Mathematica to find the average value of a 2d function f(x,y). So averaged over a specified domain. Thanks in advance for any help! Sue

Ok I've got it :) Can I remove this post?

Hello! I would like to write a multiline equation in latex Actually it is the last of these three subequations that needs to be split, but I can't work it out (neither for a single equation) though I tried a thousand split, multline, &quadd, \left\right\ and whatever commands. Is there an...