8 years, 7 days

## MaplePrimes deletets my question! Why?...

MaplePrimes

I just got an email saying a maple primes moderator deleted my question as 'SPAM'. It was not remotely SPAM but a strraight forward question about how to determine lengths of lines drawn in Maple Sketcher.

The email tells me and gives me a link to 'contact' but it's not clear which of the many possible contacts listed to use!

Here's the email:

Your MaplePrimes post Length of a line drawn in Sketcher? was deleted by a moderator for the following reason: Spam. If you believe this was done in error, please contact Maplesoft customer service: https://www.maplesoft.com/contact.

## Using Maple to measure maps, etc....

Maple 2018

I'd like to use Maple to make measurements on a map (Dealey Plaza). I can load an image in Sketcher and draw lines on it, but can't figure out how to access the lengths of those lines.

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## How to diplay lots of curves...

Maple 2018

Using Maple-18 on Window 11...

I have a set of curves in a Maple 'vector.' I want to plot them all on the same figure, but if call 'display' with the vector it makes separate plots for each one. I have to all it with each plot individual to get them on the same plot:

lc is a 'vector' of curves (I use 'vector' because I want to append and that doesn't work for 'list')

display(lc) -- plots a separate plot for each element of lc

display(lc[1], lc[2], lc[3],...) puts them all on one plot as needed, but as there will be a large numbe of curvesr it's extremely tedious.

It is a Huygens principle based simulation of diffraction.

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## 'local' dellarations inside if statemen...

Maple 2018

I find that if if declare a variable in a procedure inside a if  statement it Maple things something is wrong with the if statement:

tSound=proc(xMic,yMic,zMic,xGun,yGun,zGun,mode)

global vSound;

local locMic:=Vector([xMic,yMix,zMix]);

local locGun:=Vector([xGun,yGun,zGun]);   l

ocal delGunToMix;   if mode=1 then #`direct  `

local x=0.0;    <==remove this sand fine

delGunToMix:=locMic-locGun;

return vSound*Norm(delGunToMix);

elif  mode=2 then #`reflect off wall at z=0`

end if;   return 0.0;  end proc:

Error, invalid 'if' statement
==>I can delclare the variable 'local' outside the if. Why? It doesn't make much sense, though not that hard to avoid.

## Plottng vectors head to tail...

Maple

I'd like to plot vectors with one beginning at the head of the other. The application is a reflection at a surface. VectorPositionPlot doesn't seem to do it.

The same kind of plot would be used to illustrate vector addition.

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