## nonlinear integral eq...

how can solve this nonlinear integral eq?

## How do I solve stiff nonlinear ODE coupled with in...

Hi there

I am trying to solve the ODE below

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 (1)
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 (2)
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 (3)
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My questions are:

1. Why does the solution for the longer time span (t<10) looks different from the shorter time span (t<0.1)? I have read about stiff ODEs and probably this has something to do with it. I am trying to figure out what is going on with the solutions.

2. I tried dsolve with stiff methods (lsode and rosenbrock) and both gave me the same solutions as above. I have not tried the advance options yet. How do I set dsolve so that the solution for the longer span (t>10) looks similar to shorter span?

## Why does procedure P perform differently inside th...

I would like procedure P to perform inside the map statement exactly as it does outside the map statement. Can this be done?

Map_Procedure.mw

## LPSolve doesnt register constraint...

Can anyone tell me why maple wont accept my constraint?

Code:

LPSolve(3*x__1+14*x__2+18*x__3+6*x__4+2*x__5, {3*x__1+5*x__2+6*x__3+2*x__4+x__5 <= 10}, x__1 = 0 .. 1, x__2 = 0 .. 1, x__3 = 0 .. 1, x__4 = 0 .. 1, x__5 = 0 .. 1, maximize = true)

It returns the error "Warning, problem appears to be unbounded", when i can clearly see that it is bounded!

Im trying to solve the LP-relaxation of a binary problem which is why i have a 0..1 bound on every variable. Running Maple 2016.1 on windows if thats a help.

## Solution for integration...

Request help in solving the equation:

Eq_H_1 := C[11*m]*(int((t-(j-1)*T)*alpha*(-alpha*(K*T*beta+T*beta*j-K*T-T*beta-T*j-beta*t+T+t))^(-beta/(beta-1))*exp(-R[m]*t), t = (j-1)*T .. (K+j-1)*T))

Thanks

## How do i sum over indexes [Solved]...

Hey mapleprimes

I am trying to get the sum function to give me n variables, well not sure how to explain it, so let me show:

`sum(x__i, i = 0 .. 2)`

I was expecting to get x__0 + x__1 + x__2

Thanks for the help in advance :)

Edit:

My problem is gone, but must be some weird character that is playing games with me or something

## A few questions about DataSummary...

Hi everybody,

I have two questions about DataSummarize when used with "summarize=embed"

1. Is it possible to set the width of the table DataSummarize returns ?
(I thought DataSummarize used DocumentTools[Tabulate] but the option "width=..." doesn't work)
2. Is it possible to save this table programmatically (for instance in a jpeg file) ?

## Maple and Excel ...

Hello everybody,

I used Maple to reach a function in terms of a few parameters. The issue that I'm facing is that when I copy and paste that equation to excel(after transforming that same equation to 1D math) for evaluating it's value with the real values for the parameters, the result is not the same as the one calculated by Maple 2016 with the exact same parameters. I've inserted the file with this question for further information. One of the parameters (F15) is the cell used in excel.

equation.mw

Any help regarding this problem is very much appreciated.

## How do I get an exact number out of this function?...

Wus poppin Jimbos

My function is as follows:

f(x)=(10000/1+30762*0.478^x)+5

I can then type

maximize(f'(x))

And I get the result which is approximately 1845.361367

I then assign at a name e.g. "M"

I then try and execute the command (where I isolate the expression for x)

f'(x)=M

I get the result

x = 14.00001597 - 0.00005369289477 I

Which is super annoying to look at..

Is there any way that I can remove the - 0.00005369289477 I part? And just get the answer (which should be 14)

I have no problem executing

diff(f(x), x) = 1845.361366;
=
"(->)"

x = 13.99997555

However 1845.361367 once again gives me x = 14.00001597 - 0.00005369289477 I

Any help is appreciated <3

## How to modify the appearance of Biplot in PC analy...

Hi,

I use Statistics[Biplot] and the rendering is very bad with those huge arrows.

For the moment I fix this by modifying the definitions of the curves which draw each arrow (after using getdata to recover the Biplot structure)

Does it exist a simpler way to manage the appearance of the arrows ?
(options cb, cw and ch of plottols[arrow] are incorrect in Statistics[Biplot](..., arrow=[...]).

## DeterminingPDE Textbook Example...

I am trying to repeat the 'first example' in Stephani & MacCullum, Differential equations see chapter 16 and (16.5).  The differential equation is,

pde := b1(x, y)*(diff(u(x, y), x))+b2(x, y)*(diff(u(x, y), y)) = 0

and I would like to compute DeterminingPDE.  The textbook answer is linear in b1 and b2 (as my 'by hand calculation' is) but Maple's,

DeterminingPDE(pde)

contains quadratic terms such as b1^2, b1*b2 etc.  I don't understand the appearance of the quadratic terms.  Is it possible for Maple to return an answer which is linear in b1 and b2?

## Copy from Maple 2016 to Ms Word...

Good day everyone,

I am having challenges copying equations from Maple 2016 to word. Anyone with useful information should share please.

Thank you in anticipation for your kind gesture

## inequality plot problem...

Good day,

I have a problem with inequalities plotting (trsh_con.mw). I need to plot them(eq5,eq7) in the same box. But I get the wrong solution. The plot not giving me correct region for 2 inequalities. I attach the mw file. Are there any options to overcome such problems?

## Triangle Orthocenter division by zero error ...

I am trying to find the orthocenter in the x,y plane, given three coordinates  (x1,y1) (x2,y2) (x3,y3).

I am trying to avoid division by zero.

 > restart: orthocenter:=proc(x1,y1,x2,y2,x3,y3) local m1,m2,m3,L1,L2,L3,slope; slope:=(a,b,c,d)->(d-b)/(c-a); if x1=x2 then L1:=x=x1; elif y1=y2 then L1:=y=y1; else m1:=-1/slope(x2,y2,x3,y3); L1:=y-y1=m1*(x-x1); end if; if x2=x3 then L2:=x=x2; elif y2=y3 then L2:=y=y2; else m2:=-1/slope(x1,y1,x3,y3);L2:=y-y2=m2*(x-x2); end if; if x1=x3 then L3:=x=x1; elif y1=y3 then L3:=y=y1; else m3:=-1/slope(x1,y1,x2,y2);L3:= y-y3= m3*(x-x3); end if; print(solve({L1,L2,L3},{x,y})); end proc:
 > orthocenter(1,1,3,4,5,3);
 (1)
 > orthocenter(0,0,0,3,4,1)
 >