Hello

I have a matrix consisting of 4 variables. I want to define the values of these. Example:

A:=Matrix(2,2,[a,b,c,d]);

I am looking for an easy way to put a=0, b=0, c=0 and d=0. If I just use

A:=Matrix(2,2,0);

the variables are replaced by zeros, and not assigned zeroes as values. I know I can do it manually (by a:=0 etc.). Is there an easier way?

Morten Rask

can any one tell me what mistake i made, why there are 3 error mesaages: unable to match delimiters. untable to store my data, and independent and dependent data do not match????

Hello

I want to create three matrices, multiply two of them, equate the result to the third, and extract the individual matrix element equations:

A:=Matrix(2,2,[1,2,3,4]);

B:=Matrix(2,2,[2,3,4,5]);
                      
C:=Matrix(2,2,[a,b,c,d]);

I have two symbolic expressions which I think may be equal, one simpler than the other. I'm trying to use "is" to ascertain the equality. I tried things like:

is(expr1=expr2) assuming beta>0 and r>0 and d>0;

which returns false,

but this is what the difference between the two expressions looks like for constellations of parameters:

[okay, so here should appear the graph, but where do I store images and other files in the new mapleprimes?...

Saving a 3D object computed in Maple.  Maple itself has only limited capabilities for this.

There is a Maple library called JavaViewLib that sends the data from Maple to a Java applet called JavaView.

From there it can be viewed and saved in many different formats.

Find all the info at www.javaview.de

The last web page update was 2006, but the server that provides the free licenses is still running.

Mostly JavaViewLib...

Hello everyone,

Please help me with this:

I have a given matrix (with numbers size nxn), within this matrix there is also some parameters. I am asked to find all the b vectors that solves this equation. Important: Firstly, I was asked to find the parameters that gives us Determinant(A)=0.

I have a difficulty with 2 parameters or more, and how I suppose to solve this if x and b are (x1,x2,x3)', (b1,b2,b3)' i.e not given.

I have noticed that editing in Maple 14 in document mode becomes very sluggish if the Greek palette is left expanded while editing.  I also seem to see a refresh of the palette (maybe a very quick flash) at this time also.

Editing seems to return to normal if the palette is closed.

I am just curious if anyone else has observed this behavour.

Regards,

Frank

I try to make calculation with matrix in matix for example

n1 >0 , n2 >0; n1 ,n2 unknow
matirx  A11 := matrix(n1,n1,[unknow variables ]);
matirx  A12 := matrix(n1,n2,[unknow variables ]);
matirx  A21 := matrix(n2,n1,[unknow variables ]);
matirx  A22 := matrix(n2,n2,[unknow variables ]);

A_big := matrix(n1+n2,n1+n2 , [[A11,A12],[A21,A22]]);

how i will sovle

A_big ^ (-1) ;

The wrong answer is
matrix(...

Hi,

I want to plot a 3D function which is a summation of some other 3D functions (i.e. g(x,y) = f1(x,y) + f2(x,y) + ...). If I add them parametrically as they are, it will be a big parametric function of (x,y) and plotting takes a long time. To overcome the problem, I am thinking of calculating each function (e.g. f1(x,y)) and store its results in a matrix  for each, and then sum up all stored results. First of all, please let me know if there is an alternative...

I've been trying to evaluate another integral, like exp(-(alpha*x)^2) from 0, to infinity;

However it expresses the answer as a limit of some function(alpha), how do I get the integral to come out more exactly?

Thanks

Hello,
I have to find the internal of
E_field := conjugate((-.7147663039-.8729430992*I)*exp((9.123185068*I)*cos(phi))*cos(phi)+(0.3187576278e-1+0.3371906130e-1*I)*sin(phi)*exp((4.561592534*I)*(-1.*sin(phi)+cos(phi)))+(0.7062621752e-1+.1302618973*I)*cos(phi)*exp((2.000000000*10^(-11)*I)*(53.*cos(phi)+1.570796328*10^11))+(-0.3187599160e-1-0.3371906130e-1*I)*sin(phi)*exp((4.561592534*I)*(sin(phi)+cos(phi))))*sin(phi):

I try to solve by
evalf(simpson(E_field, phi = 0..2*Pi));

Some Posts and Questions contain broken links to files uploaded in the "old Mapleprimes". We've heard that some files (eg. image files) may be irretrievably gone.

But here is a curious page. It had an associated .mw worksheet uploaded. And the link to the uploaded .mw is now broken/stale, at the moment that I write this. But the link to view it with the maplenet viewer, in one's browser, still works. Not only that, but the .mw worksheet can be saved from within that viewer (via a URL distinct from the broken link on the Post).

How does one read in files with incremental names?

I have

for i from 1 to 10 do
   a||i:=readdata(`c:/test/i.txt`,string,7): 
end do:

I don't know how to escape the i out of the quotes so it can be used in the loop. 

I was trying to evaluate a 2-dimensional integral, but my answer contained an expression like pi/pi^2;  even trying to simplify this did not reduce the fraction properly. Why does this happen, and how can I get it to display the answer properly?

Thanks

The MRB constant is the upper limit point of the sequence of partial sums defined by s(n)= .

Each summand is a real number. However, the function f(n)= is a complex-valued function of a real number, n. This blog is a break in progression of the MRB constant series for the purpose of looking at the "complex" nature of this function. The function can be written in exponential form, .

With this first post I would like to demonstrate, in a Maple document, what happens to f [-2,0). When put together (-1,0) these graphs seem to be describing a hyperbolic spiral. I'm not sure if I'll have more to say, or not. As always, others are welcome to join in.

Download f6142010.mw