Can somebody explain me this:

I created a null tetrad, but Maple's GRQuery returns false.  Here is the code:

Hello! I have the task to calculate the two angles of an 3d linkage. now in step 11 i have these two equations:

I have to solve these for phi, that is the angle I'm looking for. But the solution for phi should be indepented of psi. alpha and beta are variables. Everything else are known constant values.
What I tried: I solved Gl7 for psi (step 12...

Hi all,

#####################################
myp:=proc(a,b,c)

local ans;

ans:=zip(`+`,a,b);

ans:=ans*c;

return ans;

end proc;
myp([$1..4],[x,y,z,w],2);
map2(myp,[$1..4],{[x,y,z,w],[x2,y2,z2,w2],[x3,y3,z3,w3]},4);

map2(myp,[$1..4],{[x,y,z,w],[x2,y2,z2,w2],[x3,y3,z3,w3]},10);
map2(myp,[$1..4],{[x,y,z,w],[x2,y2,z2,w2],[x3,y3,z3,w3]},0.5);

#####################################

Is it possible to use something like

Hi all,

##################################################################

restart:

K:=50;C:=20;

st:=time():

    for j from 2 to K do
        for c to C do
            solve({log(cat(p,j,'C',c)/(1-cat(p,j,'C',c)))=mu+cat(tau,j)+cat(eta,c)+cat(mix,j,c)},cat(p,j,'C',c));
            assign(%);
  ...

Hi,

Here an example of integral that Maple 17 cannot calculate (mean of standard Gumbel distribution)

> G:=int(x*exp(-x)*exp(-exp(-x)), x = -infinity .. infinity);

The result is known as the Euler-Mascheroni constant as shown by a numerical computation:

 > evalf(G);

0.5772156649

>  identify(%, extension = [gamma]);

gamma

> evalf(gamma)

0.5772156649

Also, it cannot compute the variance

Good morning everbody,

I am currently trying to get string and numerical datas from a txt.file but I don't get how to do this.
I have done this in matlab but I would like to make it in maple.
I have read other post about the subject and try tried this command:

 fd := fopen(dataFile,READ,TEXT):
    theData:=readdata(fd,string, 3): # 3 columns
  fclose(fd):

  A:=convert(theData,Array);

but it didn't help me. 

Is there any way to detect programmatically that a WARNING has been issued? A method that converts WARNINGs to errors would be acceptable.

Hi all,

restart:
a:=<1,2;3,4>;
whattype(a);
b:=Matrix(2,2,[1,2,3,4]);
whattype(b);
evalb(a=b);

Is there any real difference between these two methods of creathing matrices?

How do I check if two matrices are equal?

Thanks,

Casper

I'd like to be able to plot a function that not only has a range for the dependent variable(s) but also for any "variable constants" that may be in the expression.

For example, if I wanted to plot the following expression :

                    y = A sin(wx + c)

and also to explore its behaviour over the following ranges for A, w and c :

Hello!

It seems there's some problems with spaces in the name of equation

As you can see the 'SOLVE' command can't substitute variable 'b' in my example, if 'b' variable wasn't defined BEFORE the equation with spaces in its name....

I am wondering if there is a way to create a pdf from a Maple worksheet that has an animation, or in the case of Maple 17, a video, that allows the viewer of the pdf to play the animation/video.

Thanks!

Hi all,

I am trying to get the following matrix:

restart:
int00:=Matrix(3,3);
int00[2,2]:=a;
int00[2,3]:=b;
int00[3,2]:=c;
int00[3,3]:=d;
int00;
cols:=MTM:-sum(int00,1);
rows:=MTM:-sum(int00,2);
int00[1,1..3]:=-cols:
int00[1..3,1]:=-rows:
int00;

int00[1,1]:=a+b+c+d:
int00;
MTM:-sum(int00,1);
MTM:-sum(int00,2);

How do I get the sum of all elemnets in the 'original' matrix? Bascially, the int00[1,1] term in the toy example.

I just bought Maple 17 and tried to find a couple of Newman-Penrose spin coefficients.  I can do it by hand, but when I try to do the same thing using Maple I am stuck.  Maple lets me define an orthogonal tetrad, then I convert that to a null tetrad.  But how do I then fiind spin coefficients?  I know Maple has an entire list of metrics (385) already loaded, but I need to investigate different Petrov types to develop a metric.  Thanks.