## extract data from figure...

How I can extract data about figure as matrix format.

I want to save data from figure as matrix for each curve in figure as i.e.,  x and y .

for example as this format.

fig10.mw

`sol := Vector[column](4, [` 1001 x 4 `*Matrix, `Data Type: `*anything, `Storage: `*rectangular, `Order: `*Fortran_order])`

## Solving simulataneous equations- for finding maxim...

hi everyone,

I am trying to find maxima for a multi variable function. As a first step I want to find out partial differentiation and equate each expression to zero.

Normally I would expect to solve these equations to get the variable value(s). But I came across a perticular function which cannot be solved as above explained.

Expression :=30*a*sin(theta)+80*cos(theta)*b
variable :=  {a, b, theta} # using indets(Expression,name)

PartialDifferentiationExpressions :={80*cos(theta), 30*sin(theta), 30*a*cos(theta)-80*sin(theta)*b}

How can I find the critical Points from these?

My approach is to find Hessian Matrix and ten find out maxima for the function(at which critical point it happens)

Note Edit: This is an example. I am writing a script which takes an equation as Input and solve for the maxima. Hence, I would like to know how to when this kind of situation arises. Thank You

## How do I solve a system of equations in maple?...

Hi

How can i solve this system of equations:

N and P are variables and the others are constant numbers.

I used "solve" function but the results are:

piecewise(And(1 < c, 1 < d, 1 < k, 0 < -RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z)*d/((d-1)*c), 0 < -RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z)), [{N = d*k*(exp(RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z))-1)/(d*exp(RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z))-1), p = c*k*(d*exp(RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z))-d-exp(RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z))+1)/(d*exp(RootOf(exp(_Z)*c*d*k+exp(_Z)*_Z*d-exp(_Z)*c*k-c*d*k+c*k-_Z))-1)}], [])

## How do I export value to a excel file in Maple?...

Is it possible to export data from Maple to Excel where data are generated by Maple using Optimization:-LSSolve or DirectSearch:-SolveEquations function?

I have attached a file, where n is the primary variable. For n=1, 2, 3, .......... 20, I have got solution individually. But it is more time consuming event. Is it possible to use array or a vector for the variable n and solve equations at a time for all value of n and stored a excel file?
Any advice for me? @Preben Alsholm , @tomleslie or anybody
system_equations_(10.12.2008).mw

## How to make numerical result...

I've made calculation as array := function(array1,array2). Then summ of all array[i] all in one cycle. If I look in summ variable I see fu(0+fu() +.. agebraical representation. I tried evalf(summ). still algebraical. How to derive numerically?

## Calculating the following summation...

I want to calculate the following summation for a,b;

when it is odd,

vanishes.

MY TRY:

```restart:
J:=proc(a,b,c) local u,v,p,w;
p:=(a+b+c):
if p=2*k then
u:=b+c-a:
v:=c+a-b:
w:=a+b-c:
return (-1)^p*sqrt(binomial(2*u,u)*binomial(2*v,v)*binomial(2*w,w)/((2*p+1)*binomial(2*p,p)))
else
return 0
end if
end proc:
aa:=2:bb:=4:
sum(J(aa,bb,cc)*J(aa,bb,cc)*sqrt(2*(2*aa+1)*(2*bb+1)*(2*cc+1))*psi[1,cc],cc=abs(bb-aa)..(aa+bb));

```

## solve and SolveEquations result different solution...

Hi
I am confused by solve and SolveEqutions and their options!
Solving same equation results different solutions.
Which  solution is correct and why?
How i can be sure one of the solutions is correct about the other equations?
I attached my code.

Thanks.

Test2_MaplePrimes.mw

## Sum formula from series...

Its difficult for me to explain what I'm looking for so I will try with an example:

Example 1

Is there anyway any function that will say for example the sum of squares of integers for a given n say n=4, 1^2 + 2^2 + 3^2 + 4^2 = 30 that will give the equation ((n^3)/3) + ((n^2)/2) + (n/6) that gives the sum for a given n?

It would be determined from the series 1^2 + 2^2 + 3^2 + 4^2 + ... or the equation for the elements 1^2, 2^2, 3^2, 4^2 the equation that gives the sum; in this case the well known ((n^3)/3) + ((n^2)/2) + (n/6) .

So far I've got FindSequenceFunction[{1, 4, 9, 16}, n] but this only finds the individual elements not an equation for the sum of them. Of course I already know the equation for producing the individual elements.

## How can plot  f := proc (x, y) options operator, a...

How can plot  f := proc (x, y) options operator, arrow; sin(x)*cos(y) end proc  as surface and contour (contour is project on surface)

## parametric algebraic equation involving more than ...

Hi

I want to solve quadratic eqution involving more than 2 parameters...want to analize unique soltuions and real roots also want to plot the real and unique region on graphs ....thanx

the equation is -delta*(Q*S*alpha*b-a*alpha^2+M*c+b*delta) where alpha is the varible and rest are paramters

## Background Images...

Hei!

In my Maple project I want to put a simple sin graph on top of an image. But how do I create a background image with a graph on top?

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## maple take long time...

why i can not evaluate 29 polynomial. maple try to evaluate last 7hr, how many time required too solve it?

## How to change the numbers shown in the diagram sha...

How to change the numbers shown in the diagram shapes from y=0.5- to rigth form y=-0.5a.mw