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25 days ago

Does this work? syms t at bt ct f = at*bt*ct*t; syms a(t) b(t) c(t) dfda = subs(diff(f,at),[at,bt,ct],[a(t),b(t),c...

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Answered 2 years ago

I really don't like this solution at all but does this work for you?: syms x1 x2 x3 x4 x5 X = [x1 x2 x3 x4 x5].'; val...

Most likely you will need to introduce an auxiliary variable, v and equation du/dt = v since pdepe does not handle d2u/dt2 terms...

Answered 3 years ago

Q,G,H,R are alternative ways to specify boundary conditions for assempde() (static & linear case). Typically you would use them ...

Learn how you and your students can benefit from incorporating MATLAB in your physics curriculum

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3 years ago

For your point 3), in addition to Bill Greene's suggestions, it will be useful to look at the answer to http://www.mathworks....

Answered 4 years ago

Hello Uwe, I apologize - I had posted an answer before but that was very wrong so I deleted it :) I am not seeing any easy wa...

Hi Don't know if you're still looking to solve this problem. The link below shows a static plate example of converting a 4th...

Given a list of results from trades made: [1 3 -4 2 -1 2 3] We can add them up to see this series of trades made a profit ...

Solve this!

2 years ago

You have a phenomenon that produces strictly positive or negative results. delta = [1 -3 4 2 -1 6 -2 -7]; Marching thr...

Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

Regardless of input, output the string 'yes'.

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

>> solve(y-x^2-z^3,x) ans = (- z^3 + y)^(1/2) -(- z^3 + y)^(1/2)

If you still have the issue, could you just try matlabFunction(H, your variables) and see if the anonymous function is computed ...

This file exchange entry may be of use: http://www.mathworks.com/matlabcentral/fileexchange/17901-propagation-of-uncertainty

couple of ways - * <http://www.mathworks.com/help/matlab/ref/pdepe.html pdepe> for 1-D in space equations or if the symmetry...

Patric, It would be helpful to get details on the PDE formulation that shows how the domain evolves. I assume domain refers t...

vpa(yourExpression,16) would give 2376416766.651975*exp(-130.000766*t) + 23583233.34802504 Is this the sort of thing ...

You can try <http://www.mathworks.com/help/symbolic/vpasolve.html?searchHighlight=vpasolve vpasolve>, Symbolic Math Toolbox's nu...

Wasim, Assuming that your heat transfer model is LTI, I would recommend extracting system matrices from your PDE model and co...

This is with regards to the second part of your question: This problem should be solvable via pdepe. I could not infer the form ...

If I understood correctly, the geometry does not change and only the pde coefficients change. If this is the case, I would recom...

ux, uy should be the way to specify the first derivatives. Could you post your PDE and the error that you are seeing? Deepak

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