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document.write('» How to use properly the function PDEPE to hyperbolic equation
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document.write(' hi everybody
I\'m trying to use the function pdepe for this equation:
[1 - x^2]*dT/dZ = [(1/x)*d/dx*(x*dT/dx) + (1/Constant) * d2T/dZ]
This equation represent a heat equation (forced convection)
I already solve this equation making some simplifications, so it was turned in a parabolic equation.
But that form represent a hyperbolic equation and I am not knowing how I put this equation on pdepe form....
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document.write('» Re: Need help with solving a differential equation system.
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document.write(' The response from Ross_Tang on the thread that you provided would be my approach. (every n order linear ode can be reduced to a set of n 1st order linear ode equations)
Next, I would try to use these solvers in MATLAB:
[link]
The behavior of matrix C would be my interest.
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document.write('» Re: Problem with xlsinfo
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document.write(' Doesn\'t seem to matter what is in the file - same thing happens with several different files. I can\'t import xls files using the import wizard either. However, I can use xlsread to read in files as long as I specify the filename, range and sheet.
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document.write('» Python Tutorial 10 – Nested data structures
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document.write(' [link]
10.1. Nested data structures
Composed data structures, such as lists, dictionaries and tuples can be nested in Python. This means that you can use these data structures as elements of themselves.
The list above contains 3 elements.
3
[link]
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document.write('» Re: program a simple algorithm
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document.write(' These are my thoughts: I have a concern with the problem definition.
I can always think of y1 and y2 are parameters of the equation. The way you have defined the problem, it makes most sense to think of them as constants during each iteration:
Maxima of Y wrt x1 can be found at 2x1+1=0 (it doesn\'t matter what you guessed)
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document.write('» plot colour
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document.write(' Hello,
I have a 3D matrix (X,Y,Z) and i wish to plot a 2D plot of X vs Z, however i wish to colour the points by there Y value. Is it possible? any help will be mostly appreciated
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document.write('» Re: finding solution to 2 equations of 2 variables, not explicit
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document.write(' Thanks. I now have the two fminsearch commands working separately, i.e. i can find the x,T that minimize F1 and the x,T that minimize F2. There are many values of x,T that satisfy this, depending on the initial value. What I really want is the x,T that minimize both F1 and F2 simultaneously. Any ideas on this?
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document.write('» saving different variables
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document.write(' Hi could someone help me resolve this problem
i have 310 .mat files - from these 310 files i want to
(length(dates), length(AveragDailySpread)) - so i will effectively insert one row for every file.
Once i have done this for the first file i want it to loop through, inserting the appropriate data into the correct rows;
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document.write('» Massive difference in run-time between matlab and simulink calculations
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document.write(' Hi Folks
I am trying to calculate the derivatiaves of a function. However, when I implement the equations in a matlab function, and then in a simulink function, the simulink model runs a lot slower. I ran the profiler and get the results at the end of the message. Line 11 does the same as 18 and 19. Why the massive difference? I have disabled the simulink autosave function, checked for writing to the workspace etc, but I am not sure if there might be other simulink settings I can try.
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document.write('» Re: in-place operations in matlab
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document.write(' I just checked. I used 6000x6000 matrices for A, B, and C and coded up a simple C-mex routine to call dgemm directly to do the C = C + A*B calculation in-place. Attempting to do C = C + A*B at the MATLAB command line causes an out-of-memory error, whereas the direct call to the BLAS routine dgemm does not. So I think I have my answer. MATLAB does not do the whole calculation in-place. Only the element-wise + operation.
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