MaplePrimes - answers and comments on Question, Why is this so stupid ?!!

It differentiated only half of it because

Joe Riel — Sat, 14 May 2011 20:54:24 Z

It differentiated only half of it because of the way you entered the expression, that is, you have a product consisting of the derivative of exp(t/2) with the term cos(5*t). Simpler, and possibly more useful, might be to do

y := exp(t/2)*cos(5*t)

then take the derivative of y with respect to t. If you want to plot both y and its derivative with respect to t, you might assign the derivative to a separate variable and then plot them both:

dy := diff(y,t);

plot([y,dy], t=0..5);

You can type those in just as I've shown, or you can use the 2D notation, in which case your document might look like

problems

ThU — Mon, 16 May 2011 11:14:55 Z

Your first problem: yes, Maple is sometimes not intuitive.

Your second:

plot([[t^2,t,t=-1..1],[sin(t),cos(t),t=0..2*Pi]],scaling=constrained);

All problems solved .. Though it was tough

26Amigo — Tue, 17 May 2011 12:34:43 Z

All problems solved .. Though it was tough and i still don't like Maple, i appreciate the help i got.

And apologies for the strong language :O

Well .. that wasn't the issue. First problem

26Amigo — Sun, 15 May 2011 01:04:33 Z

Well .. that wasn't the issue. First problem is that it is so unintuitive!!! .. second problem, i need to plot 2 vectorfunctions in 1 graph.

Why can't i combine those ??

plots[display]

Joe Riel — Sun, 15 May 2011 03:19:29 Z

Use ?plots[display] to combine separate plot structures into one plot. For example,

plt1 := plot(sin(x), x=0..Pi, color=blue):
plt2 := plot(cos(x), x=0..Pi,color=red):
plots[display](plt1,plt2);

Actually, you can drag one plot into another. Just click on the curve. It should then be highlighted, which is indicated by being surrounded by a blue lines. Then drag the curve to the other plot. Hold down the control key to copy and drag.