use double backslash (escape character) or single slash like libname:= "C:\\Programme\\Maple11\\lib": #, libname: myLib:="C:/Programme/Maple11/_Packages/mylib/": then i would never use international characters (like an "ä") across different systems and would avoid blanks in file names and possibly would always use lower case characters Additionally be aware: exporting from German Excel depends on local language settings for decimal character (you may check your data for "." and ","), Maple uses its own.

why is it exp(1)/24 ?

Yes, eval is safer (just hate to type " [ " on German keyboards, sorry), but here one can do it. unapply: wanted to show how to plot 2 functions as 1 graphic and think it is better for a 'newbie' to show simple, single steps (and I prefer 'unapply' instead of the arrow notation).

There are various ways, here is one: restart; # good practice Digits:=14; # better than the 10 as standard n*C^2/(C*(C+n*e*h)); subs(C=100, e=1, h=2.8, %); f:=unapply(%,n); 4*n*C^2/(2*C+n*e*h)^2; subs(C=100, e=1, h=2.8, %); g:=unapply(%,n); P1:=plot(f(n), n=0..20, color=magenta): P2:=plot(g(n), n=0..20, color=blue): plots[display]([P1,P2]); For the commands used try to look up the help (and the manuals) and also look at the links given at the bootom of the help pages pointing to related stuff. PS: it is easier if you post your equations either as text (or as file, if they are longer): saves typing for others and makes it more likely they answer ...

one idea would be to look in the manual ... another to press the F1 key ... if you want to solve I would search for something like solve ... in old times one used the index of a book ... in modern times there are input fields to search ... and in current times it seems best not to do anything else but posting ...

hi you first posting do not sbeak pidsching englisch gut but can say: hope you can learn to write in english quite soon and will also be able to solve your homeworks achmed, the invisble

I always write explicite loops for i from 1 to 331 and be sure that you did not interchange rows and columns, check Demand[1, 2] and Demand[2, 1] in Maple against your data

Tried to look at your data, 4416_All_Math dep FORUM.mw however does not work for me. But I could play with viewing. Though I have no idea what it stands for, here is what I think to observe and that says: your fitting function can not be correct I take the first plot in the mentioned sheet. Setting theta=0, phi=90 i look transverse. First I ignore the last data cloud, it is different from texture ("unripe", incomplete, chaotic?). Then roughly the first mountains increase linear in size while the valleys only mildly increase (even constant ... outliers?) Comparing peaks and lows the periodics is not constant - they increase. For the shapes it seems that (compared to the extrema in each period) the values increase quite fast (not able to judge whether like root functions, but certainly not like sin/cos) and break down (like sawtooth) while for lower values this is quite smooth. With that view the last data cloud is just incomplete, your data stream seems to increase 'over time' (choose theta=0=phi). Using a 'contour plot' theta=0=phi (i.e. viewing from above) also gives the idea to clean up the data: May be you can try to adjust them in lines (hope it is clear what I mean), if the values are only different by small amounts: in this way you can make them discrete into data series or 'strips' and will be able finally to plot the beast as curves in 3 space (which has the advantage to view the curves separatly before fitting to a surface ... not sure whether I would do that in Maple only). Is there no model available in your field, which tries to describe the data? That sawtooth only for relatively high values and smooth below will be ugly to model, you need a kind of 'saturation' given by the overall hull (= a line?) Not very scientific, but my 2 cents after 2 beers :-) NB: you call yourself not an expert - but the sheet seems not that bad at all, very good visible graphic (can you try to make all walls in black?).

just guessing: a memory problem? At least such messages may appear if the DLL was killed. But one can not look closer, there are no sources ... I would ask the author, his email is in the docu

Thanks for confirming ... now I will have some ice cream :-)

thanks, i tried that (needs some guessing what-is-what), but can not get rid of the italics

my fault ... I should have read the help more carefully :-) The global array is what I did in Maple (with an hfarray), but wanted to have it local for the procedure. Anyway I am not happy with that limitation: say you have a list for a numerical proc it is not fine to declare each value ... The reason for my question was: I put Ooura's C code for BesselK into Maple and was wandering, how one could use it with Compile (so without explicitly making a DLL).

:-) even if that sounds funny, it is a big mess (and I am quite sure it violates users rights in the EC) practically I have several Excel sheets and I *have* to test them in future time (for correct behaviour w.r.t. calendars) otherwise said: not only Bill Gates seems to believe each computer his is own ...

I see it it is a problem if you need a new PC. But may be you check some info pages before, say Wikipedia - where i found the German site quite instructive, http://de.wikipedia.org/wiki/Microsoft_Windows_Vista. And it sounds horrible: you pay and get no rights for that ... And US Departments forbid to upgrade http://www.dot.gov/ost/m60/morat001.pdf Time to think about *nix and whether & how old Office software can be used.

No series expansion needed I think, it should be all in the context of finite series, the rest are formal embeddings.