If I evaluate :

assume(0 <= a); full := integrate((sin(t)-t*cos(t))^2*cos(a*t)/t^5, t = 0 .. infinity)

I seem to be getting the wrong result. Not only does the expression look strange (imaginary parts for a real integrand), but it seems also to give wrong results e.g.:

I was reminded of this by another thread.

It is faster to add in-place a large size storage=sparse float[8] Matrix into a new empty storage=rectangular float[8] Matrix than it is to convert it that way using the Matrix() or rtable() constructors.

Here's an example. First I'll do it with in-place Matrix addition. And then after that with a call to Matrix(). I measure the time to execute as well as the increase in bytes-allocated and bytes-used.

> with(LinearAlgebra):

> N := 500:
> A := RandomMatrix(N,'density'=0.1,
>                   'outputoptions'=['storage'='sparse',
>                                    'datatype'=float[8]]):

> st,ba,bu := time(),kernelopts(bytesalloc),kernelopts(bytesused):

> B := Matrix(N,'datatype'=float[8]):
> MatrixAdd(B,A,'inplace'=true):

> time()-st,kernelopts(bytesalloc)-ba,kernelopts(bytesused)-bu;
                            0.022, 2489912, 357907

I reciently upgraded to maple 12, and am hoping it was not a mistake...  The "problem" is that now xmaple seems to have no clue as to the rules of precedence.  Before the upgrade (I was using 9.5) the expression 5/7*3 evaluated to 15/7 as it should.  Now, xmaple 12 thinks the answer is 5/21.

Is there some sort of download to fix this, or perhaps some "please evaluate using standard rules of precedence" setting I can use so that xmaple 12 is able to do arithmetic at least as well as the old 9.5 version?

 

 

Consider the following simple procedure

>F:=proc(LL::{set(list(integer)), list(list(integer))})
    LL;
 end proc:

 

Now execute this little loop

Hello Everyone,

This is more of a request for clarification than an actual problem:

I have written a procedure that involves multiplication, inversion (using LinearSolve) and eigenvalues/vectors (using Eigenvectors) calculations. The matrices are large (~3600 x 3600), consist of floating point complex numbers, and on occasion I need to hold several in memory at once. Therefore, I want to make sure that all of the calculations (and storage of resulting matrices) are done using double precision, not arbitrary precision, in order to minimise the memory usage.

A:=Matrix(2,3,1,datatype=float[8]);
                             [1.    1.    1.]
                        A := [              ]
                             [1.    1.    1.]

ArrayTools:-AddAlongDimension(A);

                               [2., 2.]

B:=Matrix(3,10,1,datatype=float[8]);

             [1. , 1. , 1. , 1. , 1. , 1. , 1. , 1. , 1. , 1.]
             [                                               ]
        B := [1. , 1. , 1. , 1. , 1. , 1. , 1. , 1. , 1. , 1.]
             [                                               ]

Can anyone explain the following (in Maple 11):

>maptype(set,evalf,[2.2222]);

 returns   [2.2]

whereas

>evalf([2.2222]);

 returns [2.2222]

My reading of the help page is that if [2.2222]  is not of type set (which it isn't) then maptype should return evalf([2.2222]);   It would seem that in this context, evalf is acting as evalf[2] independent of the prevailing Digits.

i have a computer with windows Vista and i saw that maple 7 doesn't work on vista.

so,I wonder if maple 7 worksheets and .mpl files can be read on maple 12 which works with Vista.

 

When I click on the help menu, Maple hangs for a second or two (spinning beach ball) before it shows the menu. None of the other menus exhibit this behavior, and the help system opens very quickly if I use the button on the button bar, rather than the menu. Is anyone else experiencing this? Any workarounds? Thanks, Paul ps, MacBook Pro, 2GB ram, OS X 10.5.2, 320GB hard drive.

Upgrading to Leopard introduced some conflicts with Maple 10 and 11, apparently arising from the new Java implementation. There are a few threads in this forum which address most of the issues. However, one has, for me, persisted, and I haven't seen it addressed anywhere else online, so I figured it might be good to start a topic.

...and the only way I found to recover is to kill Maple.

~Rich~

Hi everyone, i've got a strange question: I wanted to use monte carlo method to count the volume of the ball i 've choosen a [-1,-1], [1,1] square and ball of radius 1 to do it. i wrote something like this: with(Randomtools): k:=1000 Generate(list(rational(range=-1..1)+I*rational(range(-1..1),k)): map(abs,%): select(verify,%,1,'truefalse'('less_than')): evalf(nops(%)*4/k) the result is ok (3.14 in the first try ;) ), but I wanted to do a little "upgrade" and have written a little shorter formula: (now doing "abs" is not necessary) with(Randomtools): k:=1000

I have an embedded plot in View 1292_Embedded plot does not update correctly.1.0.mw on MapleNet or Download 1292_Embedded plot does not update correctly.1.0.mw
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I have found that once I have "ugraded" to AVG Free 8 (the antivirus of Grisoft) Maple 12 Classic GUI no longer finishes starting: the splash screen remains, the red button is on, pressing it issues "You are in the middle of a computation. Do you wish to interrupt it?". Pressing it gives me a non responsive GUI. And the task manager is required to kill the zombie proceses that remain after closing the GUI.

I'm getting the following errors when installing Maple 12: 5/28/08 3:45:47 AM [0x0-0x26026].Maple12MacInstaller[471] 2008-05-28 03:45:47.676 IAAuthentication10_4[477:10b] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary. 5/28/08 3:45:47 AM [0x0-0x26026].Maple12MacInstaller[471] 2008-05-28 03:45:47.683 IAAuthentication10_4[477:10b] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.