## Problem with maplet ...

Maplet file failed to open by double click in windows 7 x64 file browser

There is no response when double click a Maple file

But it runs correctly by using command line

Anyone knows why?

## Expanding integral of series ...

Dear all

If its possible in  Maple to change the integral of the sum to  the sum of integrals when I calucle the integral of a function series

Thank you

## Does mtaylor ignore "assuming"?...

I have the following expression (generated by some other procedure):

This does not have a taylor expansion in pV[6] in the general case because the square roots can become negative:

taylor(xpr,pV[6]);
Error, does not have a taylor expansion, try series()

But I can get an expansion by restrictig the range of pV[6]:

taylor(xpr,pV[6]) assuming -0.01<pV[6],pV[6]<0.01;

So far things are perfectly fine. But when I try mtaylor:

mtaylor(xpr,pV[6]) assuming -0.01<pV[6],pV[6]<0.01;
Error, (in assuming) when calling 'mtaylor'. Received: 'does not have a taylor expansion, try series()'

So the assumption seems to be ignored. I can work around this by expanding in pV[6] first, using taylor, and then expanding the result from that using mtaylor (I really also want the expansions in the other pV components; 6 in total although in this example some do not show up). I'll have to convince myself that this work-around gives the correct result but I think it does. However, I don't particularly like it.

I consider this a bug and am tempted to submit an SCR. But before I do that; is there anything obvious I am missing here?

Thanks,

M.D.

PS: This was done using Maple 15. I'll check newer versions later.

mtaylor_assuming.mw

## Web solutions to Advanced Mathematical Methods wit...

Solutions are available at http://mcs.open.ac.uk/dr9, however when I open them they appear in Code, I am running Windows 10 and wonder if this is the problem,

## Unknown error when the program starts...

Hello, when you run an error occurs:

Error, (in plots:-display) unknown plot object: circle
Error, (in plots:-display) expecting plot structure but received: P[0]
Error, (in plots:-display) expecting plot structure but received: PP

Programm: https://dropmefiles.com/Qnkzn

## Geometric Proof...

I attempted to show that two lines are parallel.  I started with a problem in Geometry for which I do not have the solution.

I tried several ways with Maple to show this to be true.  Most of the time, I ended when maple could not determine if a-b = c-d, etc.

brg_proof.txt contains a statement of the problem and my latest maple code.

Question: How should I approach the proof, by the compass and straight edge method?  Is this possible in maple?

## Use it as Maple code...

My problem is: I`d like to parse a value from JSON string and use it as code in Maple.
Ex. This is my value from JSON string: "restart:\na:=5:\nb:=3:\nP:=28*10^(-3):"

and that`s all, I`ve tryed to use JSON.Parse - it says me it`s not JSON. Sscanf - nothing.

## Geometry Intersection Fails...

intersection in the geometry package does not seem to recognize assume.

restart: with(geometry):

assume(p[1]<>0, p[2]<>0, p[3]<>0);
assume(q[1]<>0, q[2]<>0, q[3]<>0);
point(T,[p[1],q[1]]);
point(U,[p[2],q[2]]);
point(V,[p[3],q[3]]);
point(Op,[0,0]);

line(OT,[Op,T]);
line(OU,[Op,U]);
line(OV,[Op,V]);

point(B,2*q[2],solve(subs(x=2*q[2],Equation(OU)),y));
coordinates(B);
IsOnLine(B,OU);

eval(x,sol);
point(A,eval(x,sol),eval(y,sol));  ## the intersection exists

## How to parse with certain options? ...

Hello people in mapleprimes

In the help of parse, there is the following example.

I could not understand why the first one is 4, and next 4^2, and the last 4^3 appeared, there.

Please tell me the way n is increased with the output taking 4, 4^2 and 4^3 sequentially in this example.

n := 0;
n := 0
input := "a := 4; a^2; a^3;";
input := "a := 4; a^2; a^3;"
4
16
64

I know that it is written in the help that lastread shows the next unparsed character,

with the offset the next statement.

taro

## How to add variable y to a single variable equatio...

I had a single variable equation but I do not know where variable y come from for using genus to run

## Question about Igusa invariant ...

how to compute Igusa invariant in maple?

why it is not included in maple?

## Many accounts with the same e-mail address?...

I found useful to use the email address of a relative I live with, to create my own account on Maple Primes.
But I have just realized that his own account has disappeared.

Is there a way to have two differents accounts with the same email address ???

If not I will create my own account on my private email addresss

Sorry for the mess

## Extracting View from Several Plots...

I have several plots generated with geometry objects:

plt1 := draw(...); plt2 := draw(...)

I want to display all them with a reasonable window.  I have been looping and and using a rather dumb proc to find the window size. I use the view=[...] option with the values calculated to set the plot view.

I wanted to post the proc, but, really messed that up!  I will try the proc later.

Some of the plots I am working with have views like

> for itm in [relBrgLinePlot,relTgtPositPlot,relTgtLinePlot] do
op(-1,itm);
end do;
VIEW(0. .. 95., -61.58179461 .. 16.)
VIEW(5.48225506 .. 95., -61.58179461 .. 16.)
VIEW(5.48225506 .. 95., -61.58179461 .. 16.)

> for itm in [geoSensPositPlot,geoSensLinePlot,\
geoBrgLinePlot,geoTgtPositPlot,geoTgtLinePLot] do
op(-1,itm);
end do;
VIEW(0. .. 35.35331852, 0. .. 87.13244438)
VIEW(0. .. 35.35331852, 0. .. 87.13244438)
VIEW(0. .. 95., 0. .. 87.13244438)
VIEW(40.83557358 .. 95., 16. .. 25.55064977)
VIEW(40.83557358 .. 95., 16. .. 25.55064977)

Is there an easier way to do this?

## Why doesn't implicitplot3d work?...

with(plots);

implicitplot3d((x+y+z)^2=0, x=-100..100,y=-100..100,z=-100..100)

can be plot, and only show me an empty box.

and i get the same empty box when i reduce the interval.

for example :

implicitplot3d((x+y+z)^2=0, x=-5..5,y=-5..5,z=-5..5)

and

implicitplot3d((x+y+z)^2=0, x=-0.1..0.1,y=-0.1..0.1,z=-0.1..0.1)

thanks for reading this question, and i hope i get an answer.

## Grid Lines on X11 Device...

Linux.  I want to put grid lines on an x11 device.

The x11 device is better for plotting because if the window is resized, the plot resizes with it.

restart;
plotsetup(x11);plot(sin(x),x=-1..1,gridlines = true); ## no gridlines

restart;
plotsetup(maplet);
plot(sin(x),x=-1..1,gridlines = true); ## have gridlines

Any way to get gridlines on x11 device?

Tom Dean

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