The following is true 'sum(min(2, j)/factorial(j), j = 1 .. infinity)' = 'sum(min(2, j)/factorial(j), j = 1 .. 2)' +'sum(min(2, j)/factorial(j), j = 3 .. infinity)'; But Maple 11.01 thinks it isn't. The answer it gives is 2*exp(1)-2 = -3+2*exp(1) The answer on the right is correct. One the left, Maple seems to think that min(2,j)=2 (which is correct except for the first term in the sum). The problem doesn't seem to arise for finite sums.

In statistical analyses, it is common to fit a model to data where, say, the x-coordinates are known exactly and the y-coordinates are known inexactly, with some assumed error distribution. It is often useful to plot the data, with bars indicating the std. deviation (say) of the potential error in the y-coordinates. Maple's Statistics package has a procedure for doing that: ErrorPlot. ErrorPlot, however draws error bars horizontally, instead of vertically. I do not understand this, especially as the Help seems to indicate that the errors are in the y-coordinates, as usual in statistics. Why are ErrorPlot error bars drawn horizontally?

I knew what to do once, but cannot remember... F(1/j!, j=1..5); ...where... F := proc(X,Range) k := lhs(Range); ... computations of a ... subs(k=a,X); ... end; What do I do to make this subs work...??? k should be 'j', where that 'j' is the global variable.

Compiling the OpenMaple sample file omexample.c, and executing omexample -r I get the expected welcome, preceded by this first line: Enhanced external functions enabled.

    |\^/|     Maple (Example Program)
._|\|   |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2004
 \OPENMAPLE/  All rights reserved. Maple and OpenMaple are trademarks of
 

What are these "Enhanced external functions" ? Regards, Alejandro

The recent 11 upgrade states that it has vista compatibility and.. * Maple 11.01 also provides improvements in a variety of areas, including: o Differential Equations o Maplets o Physics Package updates o Plot legends, and o Vector Calculus So is there a way to know exactly what the other enhancements are? Where can I find a web page or changelog that describes the update in more detail. thanks, DG

Dear there, The `if` operator has tortured me for the whole day. Can anybody help? Thanks so much for your time and patience. Michael Chen ======================================================================== > restart; > B11:=x1

Besides this one, can anyone suggests any forums for getting help with mathematics? I need one in which I can use Maple to write mathematical expressions in posts. Thanks!

Dear all, I calculated the eigenvectors of a unitary matrix with Maple10. (that is, I'm dealing complex vector space) Also, I computed it with C program made by myself. The eigenvalues coincide in two methods up to their order. But eigenvectors are different up to complex phase. Let me say, Let E_M(i) be the i-th eigenvector of the given matrix A calculated by Maple10 and let E_C(j) be the j-th eigenvector of A computed by the C program. Both of them are eigenvectors of A, that is, A&*E_M(i) = lambda(i)*E_M(i) and A&*E_C(i) = lambda(i)*E_C(i) are satisfied. But, dotprod(E_C(i), E_M(j)) != kronecker_delta(i,j).

Does anyone else see the following strange behaviour in the Maple 11 plot engine?

I was acting in a Std GUI Worksheet, not a Document. (I use Maple for 64bit Linux, which may or may not matter.)

1) In this next plot below, a (superfluous?) solid triangle appears. It lies in a xz-parallel plane at y=-1, with vertices (0.0,0.0,0.0), (1.0,-1.0,0.4), and (1.0,-1.0,0.0).

plot3d(sqrt(1-y^2),x=1..2,y=-1..1,colour=red,filled=true,view=[-0..2,-1..1,0..1]);

The following lines execute properly in Maple 10 and not Maple 11. restart; with(DEtools): DEplot( diff(y(x),x)=8*x^3*y(x), y(x), x=-5..5, [[ y(0) = 4 ]], y=-5..5 ); When run in Maple 11, Maple seems to be doing a lot of extra dsolve/numeric calculations and then just hangs when dsolve/numeric/SC/IVPrun calls external hardware nonstiff integrator with evalhf = true.

I am trying to get used to Maple 11 after a happy coexistence with Maple 10 Classic Worksheet. I have programs that take a long time to execute and I've gotten into the habit of using printf to write to the screen each time a counter is increased, for instance. In Maple 11, none of this information gets written until the program finishes execution (sometimes after hours) so my attempts to monitor progress are useless. What's going on and what's the correction? It would seem Maple is buffering unwantedly. ................Edgar

I am running Maple 11 with a mac-intel MacBook (13'' screen). I have been running a procedure for plotting a system of differentail equations that depend on an arbitrary parameter. The procedure works well for some "simple" parameters. For some more complicated parameters, the memory count (bottom right hand size) goes from near zero to over 500 M in six seconds ! A message appears: "kernel connection lost", and warns that such problems could be due to firewall settings, but all my firewall software is off. This procesure on these parameters works just fine with Maple 10 running in a PowerBook G4 (firewall connection also off).

Why is it that there is an XML attribute that I can add to a text field to make the text contained within read-only, but there does not seem to be an option in any menu to let me select certain text and make it read-only? In older versions of Maple, I believe this option was available.

Type the following line into Maple as 2D-Input: foo := "1 + 1"; And then type this next line into Maple as Maple Input: bar := "1 + 1"; Yes, it's the same thing in two different variables, but try to parse them. parse(foo); will work, whereas parse(bar); will return an error. It seems that when the same string is entered in the "classic" Maple Input, something doesn't get tripped to convert the MathML markup into syntax that the parse() command will read.

Recently I have experienced two ways to loose a whole Maple document (if I had not had a slightly outdated backup copy): 1. Do NOT collaps and expand sections, because it may cause the document to explode in size, but much worse, make it virtually impossible to execute. It seems appaling to me that typographical considerations should destroy a perfectly sound document. 2. Do NOT write something like SubMatrix(Matrix,1..0,1..0), because the 0's makes the line unaccessible, but much worse, it makes it impossible to reload the whole document. I'm using Maple 9.5. Has these fatal errors been corrected in Maple 11?