restart:with(plots):
eq:=(diff(f(eta),eta$2))-a*f(eta)+b*(1+diff(f(eta),eta)^2)^(-1/2)=0;
bc:=f(1)=0,D(f)(0)=0;
ans := dsolve(eq);

Is there a way to see just the titles of, say, the last 100 questions?  Looking into recent questions I see the full post, so that requires moving up and down multiple pages. Really painful.

hi.how i can determind  eignvalue of matrix in the form parametric?

thanks1.mw

Download 1.mw

I need to create n-order tensor filled with any symbolic variable, for exemple 'x', but "symbol" option works only on vectors and matrix, so i don't know how to do that on n-order array.

X := Vector(3, symbol = x);#------ Work
Matrix(3, 3, symbol = x);#------ Work

Array(1 .. 3, 1 .. 3, 1 .. 3, symbol = x);
Error, argument `symbol = x` is incorrect or out of order

And 2nd problem thet globaly i need to create symmetric n-order tensor with symmitry for any pair of index and with contraction for any couple of indexes equal to zero. As i understend i need to create a big list of equations for every individual pair of index and 2 conditions (contraction and symmitry) and solve it to get a match and combination of independent index and paste values in them?

hi dear

i wright this formula for solving by two variable but it dont solve and i recicive this message (warning solutions may have been lost)

please help my

thanks

Doing the following:

Why is int used when defining F not evaluated to x^2/2 when used to defined function F as shown in (2), when the int is evaluated when used separately in (3)?

How do I filter a DataFrame using a value in a string column?
I have a CSV file containing records. Some columns are numbers, others are strings.
The examples in the tutorials are good for filtering on numbers but I can't see how to filter using a string.

ie I have 1300 records with ID, Name, Region, enrolments, ...
enrolments is a number and I can filter on that.
Region is a column of strings. I want to filter on that and work with all records from a specific region.

Thanks,
David Moss

I upgraded my OS from Ubuntu 14.04 to Ubuntu 16.04.

When attempting to start maple, I get

Licensing error:-9,57

What does this mean?

Dear all,

I am looking at the help page for reading json files, but it is too advanced for me to understand...

Can anyone give an easy example where a json file is read into a variable and printing the data structure?

Hugs,
Louise =)

I can draw a triangle using the geomtry package:

point(A, 0, 0), point(B, 2, 1), point(C, 2, 0); triangle(T, [A, B, C])
d := draw(T, axes = none, color = black); t := textplot([[.227, 0.60e-1, typeset(theta)], [1.1, 0, typeset(k__2)]])
display(t,d)

The result is as below.

I would like to place the label k2 below the line but negative numbers do not work. I would like to put a label k1 to the right of
the opposite side but there is no room,  and finally I would like to put sqrt(k1^2+k2^2) above the hypotenuse slanted to be
parallel with the hypotenuse if possible.

  Hi, there

How can I draw the excircles, incircles,circumcircle and their centers of a triangle simultaneously with maple13 in a geometric plot? please specify the commands.

many thanks for your help

M.R.Yegan

Hi All

Assume that we have a stochastic model with following density function

and our goal is to estimate unknown parameters namely, alpha, beta, landa, mu and sigma by any available method especially maximum likelihood estimation method.
How can we do it with maple software?

Does the "MaximumLikelihoodEstimate" command can help?

or should i define Maximum Likelihood function first and then differentiate it according to unknown parameters?

thanks in advance

Mahmood   Dadkhah

Ph.D Candidate

Applied Mathematics Department

Download operator.mw

Regards

I defined a procedure, OrderB(0,b,c), that essentially determines the order of a group that is defined by 2 parameters (the first parameter is always zero), so the output is an integer and the procedure is defined for every integer value of both parameters. I wanted to structure the outputs into a matrix with columns that represent one parameter and rows that represent the other. However, whenever I try to apply a method of defining the matrix, Maple returns the values of the procedure and then gives me an empty matrix.

>f:=proc (i, j) -> OrderB(0, i, j+3);
>Matrix(3, f);
                               1
                               4
                               1
                               1
                               4
                               1
                               1
                               4
                               1
               [NULL,NULL...]


I tried a second method where I defined a set s such that:

s:={(0,0)=OrderB(0,0,0) , (0,1)=OrderB(0,0,1).....}

but upon execution, maple returns:

1
4
1
....
s:={(0,0)=( ), (0,1)=( )...}

Please Help. I don't know what I'm mising in the code that is keeping Maple from putting the outputs of my procedure into the matrix.

Been working on a diffy q project, new to maple here. Any help is appreciated. Keep getting a similar error.

"Error, (in dsolve/numeric/type_check) insufficient initial/boundary value information for procedure defined problem"

I thought I gave it initial values?

link to screenshot of the error bellow:

http://i.imgur.com/YVE1x7e.jpg