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Using Analytical Tools to Gain Insight and Speed-up Num. Analysis in MATLAB & Symbolic Math Toolbox

files from the webinar

mer än 6 år ago | 3 downloads |

MATLAB Symbolic or MuPAD, How can i get a dependent variable of equation in terms of the other variables?

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

mer än 8 år ago | 0

Problem with large symbolic matrix in matlabFunctionBlock

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

mer än 8 år ago | 0

Differentiate symbolic composite function

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...

mer än 8 år ago | 0

| accepted

help in propagation of uncertainty calculations

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

mer än 8 år ago | 0

How can i solve Simultaneously pde in matlab ?

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

mer än 8 år ago | 0

PDE in time varying domain

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

mer än 8 år ago | 0

Solved

How many trades represent all the profit?

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 ...

mer än 8 år ago

Solved

Flag largest magnitude swings as they occur

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

mer än 8 år ago

Assign Values to Each Element of Symbolic Array

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...

mer än 8 år ago | 0

| accepted

simplify the result from symbolic tool box

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

mer än 8 år ago | 0

Solved

Weighted average

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

mer än 8 år ago

Solved

Times 2 - START HERE

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

mer än 8 år ago

What solver to use for parabolic equation?

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

ungefär 9 år ago | 0

How can i solve elliptic pde using pdepe? I need the MATLAB form of the equation.

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

ungefär 9 år ago | 0

| accepted

How can I integrate PDE tools [for 2D heat transfer] into a Simulink model?

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

ungefär 9 år ago | 0

Boundary conditions for pdenonlin

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

mer än 9 år ago | 0

| accepted

solving coupled PDEs using method of lines

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

mer än 9 år ago | 0

Export meshdata and solution from pdetool

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

mer än 9 år ago | 0

first order derivative in matlab pdetoolbox

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

ungefär 10 år ago | 0

Where can I find the best tutorials/texts on how to export a solution of a PDE equation created in PDE toolbox to the command window to fit equations which include the PDE solution to real data?

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

ungefär 10 år ago | 0

| accepted

Can pdetool() output the stream function?

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...

ungefär 10 år ago | 0

| accepted

Fourth Order Hyperbolic PDE's

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...

ungefär 10 år ago | 0

| accepted