# Items tagged with collectcollect Tagged Items Feed

### how to evaluate to this equation

February 06 2013 by Maple

0

4

http://en.wikipedia.org/wiki/Laguerre_polynomials

how to evaluate to equation (5.9) in page 195 from rodrigues formula?

rodrigues := exp(x)*(x^alpha)/n!*Diff(exp(-x)*(x^(n+alpha)), x$n); rodrigues := subs(x=2*p, rodrigues); rodrigues := subs(alpha=1/2, rodrigues); ### collect and sqrt December 12 2012 by Maple 1 8 Hi, this must have been asked numerous time, but I cannot find it in MaplePrimes: How does one "collect" sqrt terms? collect(expression,sqrt) does not work because sqrt is actually represented as ^(1/2) in Maple. collect on '^' does not work either... ?? Mac Dude ### Force collect an almost common factor October 18 2012 by Maple 16 0 3 Hello everyone, I like to force following: a/(a+b) ---> 1/(1+b/a) I know that collect is a powerful tool that is actually capable of doing such things. In a similar (old) thread, it was suggested to use a function in the last part like collect(expression, varialble, (x->something)@factor) but I don't understand what exactly this means. Any help? another related question is, is the collect command available as right-click option? ### Dividing a multivatiate polynomial March 30 2012 by Maple 15 0 1 I have a rather large multivatiate polynomial "Dtest" I need to divie it by a cubic poly "DGm" using rem and quo. Both are determinants multiplied out, both given below. Have spent the past 2 nights trying to sort, collect, expand, equate coefficients plex groebner etc. Am trying to collect up all the powers of c3 but cant anything to work. even expand doesn't fully expand "Dtest". If I set c1 and c2 to 1 things are... ### cannot find the error January 21 2012 by Maple 14 0 3 I wrote the following MAPLE code restart; N := 2 alias(epsilon = e, eta = t) eq1 := 5*(diff(F(t), $(t, 3)))+(1+3*e)*F(t)*(diff(F(t), \$(t, 2)))-(2+e)*(diff(F(t), t))^2 = 0

F := proc (t) options operator, arrow; sum('F[i](t)*e^i', 'i' = 0 .. N) end proc

deqn := simplify(collect(eq1, e), {e^(N+1) = 0})

MAPLE says

Error, (in sum) too many levels of recursion
How do I get this error corrected?

### How to program the following three-steps...

December 13 2011 by Maple

0

3

How may I program the following with Maple?

(1) Define the function:

H(p) := p * c1 + p^2 * c2 + p^3 * c3  + ......

(2) Now construct the following expression:

(1-p) [ v''' + 1 ]  = H(p) [ v''' - 25 * v' + 1]

Here, v is some funciton of x.

(3) Now assume: v = u0 + u1 * p + u2 * p^2 + ...

and substitute this into the expression defined at the point (2).

### output cosmetics (collect, etc.)

May 26 2011 by Maple

1

6

Hi there,

I got an output

and would like to bring it in the form

.

How do I do that? :)

In fact I don't even manage to collect the factor of 3*beta^2 as follows

### why doesn't collect work in all cases?

May 18 2011 by

Why does collect only work sometimes?

I will show with a simple example.  I can do this

a := 5*x^2-4*x+3;

a := 5 x2  - 4 x + 3
h := exp(x)*a+exp(x);
...

### Do you know how to collect the terms...

April 18 2011 by Maple

0

1

From this expression I want to extract only terms with the variable x.

F := (1/2/Pi+Q*cos(k*x))^2*(1/2/Pi+Q*cos(k*y))/(1+beta^2*(1/2/Pi+Q*cos(k*x))^2);

I don't want to manually write it out rather extract the terms programmaticallly. I want to be left with

(1/2/Pi+Q*cos(k*x))^2 / (1+beta^2*(1/2/Pi+Q*cos(k*x))^2)

I have tried the collect fucntion but that did not seem to do it. Any suggestions...

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