jm@france-paris.org

Dr. Jean-Michel Collard

220 Reputation

9 Badges

17 years, 265 days

MaplePrimes Activity


These are questions asked by jm@france-paris.org

Hello there,

I have the following problem (see the screenshot) : which means "Connection to kernel lost. Restart Maple".I have no problem with my firewall.First time I see this error.

Take care,

Jean-Michel

Hello,

There seems to be an error in CUDA and/or . (dot)

The exemple is taken from the help page for CUDA.

Kind regards,

Jean-Michel

(Ican't uoload the document. Seems UPLOAD is not working).

Just run the hepl page for CUDA

Hello All,

This morning I tested for the first time Maple's CUDA capablities.

(I took the following example on the Maplesoft website)

with(LinearAlgebra); CUDA:-Enable(false); CUDA:-IsEnabled(); a := RandomMatrix(4000, datatype = float[8]); b := RandomMatrix(4000, datatype = float[8]); t := time[real](); c := a . b; time[real]()-t;
                             false
                             7.489
with(LinearAlgebra); CUDA:-Enable(true); CUDA:-IsEnabled(); a := RandomMatrix(4000, datatype = float[8]); b := RandomMatrix(4000, datatype = float[8]); t := time[real](); c := a . b; time[real]()-t;
                              true
Error, (in unknown) CUBLAS internal error
                             7.183

As we can see there is not significant improvment on my machine with/out CUDA.

(I don't understand the CUBLAS error)

My graphics card is a GTX960 4 Go GDDR and 1024 cores.

Voilà.

Jean-Michel

 

 

Hello All,

What is the Maple equivalent command for $MaxNumber/$MinNumber and $MaxMachineNumber/$MinMachineNumber (these should be 10^308/10^-308) found in Mathematica.

I never asked this question before because I do *not* like comparisons between Maple and Mathematica, as I said in a post some months ago.

Best :)

Jean-Michel

 

How to simplify this result in order it returns the correct answer i.e : sqrt(Pi)/2*exp(-2*abs(x))  -infinity<x<infinity.

int(exp(-t^2-x^2*t^-2), t = 0 .. infinity);


print(`output redirected...`); # input placeholder
  /
1 |
- |
2 \
            /     /                    / 2            \
  1   (1/2) |     |                    |t  + csgn(x) x|
- - Pi      |limit|exp(4 csgn(x) x) erf|--------------|
  2         \     \                    \      t       /

                           /  2            \                  \\
                           |-t  + csgn(x) x|                  ||
   - exp(4 csgn(x) x) - erf|---------------| + 1, t = 0, right||
                           \       t       /                  //

            \                  
       (1/2)|                  
   + Pi     | exp(-2 csgn(x) x)
            /                  

 

It comes from Peirces's Tables No 510.

I have notice that Maple's integrator is very efficient.It is one  integral from these tables that Maple can't handle directly.

To be contined later.

Best,

Jean-Michel

1 2 3 4 Page 3 of 4