I calculate a long polynomial p(x) where the coefficients depend on a varaiable d. That takes about 10 minutes. I put a colon at the end of the computation because the result is very large. Then I put d=12.2 say and proceed to do a lot of other things. All well and good. I save the file as fooapril23 and go home. When I return I want to repeat the computaion with d=12.5 which I can do by opening the file, saving it as fooapril24. Then I have to recalculate p which is 10 mintes wasted until I can say d=12.5 and proceed with my work..  I would like to "park" the result for p in a file somewhere and then import it when needed. I went to the read and writeto help pages but could not understand it at all. (I tried bit when I did the writeto command and then opened a new worksheet and tried to read I got an error:

Error, on line %1, syntax error, `>` unexpected:

(The > was the Maple prompt I guess.)

I have tried over the years to use the writeto and read commands but I think the help pages are written for unix gurus and I am a Mac user.

BTW I am using Maple 2026 My worksheet starts with > restart; Digits:=20: with(Plots):
I guess requiring the with(Plots): command in 2026 is some kind of an in joke?

nans:=dsolve({(-y^4+y^2)*diff(U(y),y,y)+(-2*y^2+14.2)*diff(U(y),y)*y-15.2*U(y)*(U(y)-1)*(U(y)+1) = 0, DU(.99999) = -.3401375821,U(.99999)= 0.3000034013},numeric);
Error, (in dsolve/numeric/process_input) invalid specification of initial conditions, got DU(.99999) = -.3401375821

I have an ode y''(x) + ...=0 that depends on a parameter a and I would like to see how the solutions vary with a. I created a procedure using odeplot to yield a sequence of plots and display them. Not bad but I really need to look more closely. Plotting y for a=7 and overlaying a plot for y=7.1 is too crude. I want to look at y(x,7.1) - y (x,7) or y(x,7.1) /y (x,7) for x=0..3 say. The obvious solution is to compute y(x,7.1) for x=0..3 and save it as a vector and also y(x, 7). How can I do that so that the pointsx at which y(x, 7.1) are the same as the pointsx for which y(x,7) are evaluated. In other words, how can I specify to dsolve the intermediate points xj for which y(x) is calculated? 

I am starting a new project and I anticipate creating dozens of files along the way. Each file will need the same collection of definitions, procedures, etc. and I would prefer not to have to copy and pace them as a preamble each time I open anew file. I guess I could write some startup code but would that mean every time I open an unrelated Maple file the Startup code would be laoded? I will be using Maple for other things besides this project. Also, while the stratup code would be hidden most of the time I would perhaps like to be able to see what the n1 procedure is; n1(x) would invoke the procedure-I just want to see waht it does. I usually endup up labeling my files in some lazy way so if I want to go back and find something it takes for ever. Any suggestions for improving that?

Thanks,

I tried the following procedure in a worksheet; Maple did not like it and claimed there was an error. However, I cannot even copy this to a Maple prompt; it jumps to another type of region. Any ideas? If I retype the command there is no problem with an error.

It reminds me of Maple 2 and the letter t which sometimes had to be retyped to get Maple to respond-a very strange bug which was eliminated years ago.