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Ronan

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13 years, 352 days
East Grinstead, United Kingdom
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These are replies submitted by Ronan

How to submit a bug report & enhancment ...

Ronan 1396
May 16 2025
0 0

@dharr  How do I submit a bug report or do Maple pick up the problems directly from these questions?

An nice enhancement from Maple would be to have predefined template sizes A4, A3,.... one could pick from. I  would be inrerested to know how people who write papers manage.

2024?...

Ronan 1396
April 23 2025

Can this be used with Mple 2024?

Possibly Probe info...

Ronan 1396
April 19 2025
0 0

@Alfred_F RMB on the plot and select probe info. Would that do?

lhs and rhs...

Ronan 1396
April 19 2025
0 0

@Alfred_F Left hand side lhs and Right hand side rhs can be very useful when = is involved.

Same on my machine...

Ronan 1396
April 07 2025
0 0

I'm using Windows 10

Very Nice...

Ronan 1396
March 22 2025
0 0

@Rouben Rostamian  That is well explained. Vote up. 

Horizontal line through parallelogram ce...

Ronan 1396
March 21 2025
0 0

@Kitonum I was doing it visually at work on a friday afternoon and using a calculator. I admit my reasoning may be incorrect. What I meant was, if one draws a horizontal line through the center of the parallelogram that would split the blue triangle in half. The top half triangle should be similar to the yellow triangle.

Looks dubious...

Ronan 1396
March 10 2025
0 0

I would stay off it.

 

Shall experiment...

Ronan 1396
January 01 2025
0 0

@Scot Gould Thank you. I will experiment with that. 

Recent files....

Ronan 1396
January 01 2025
0 0

@Christopher2222 This is just a guess. Possibly the recent files only gets updated when one shuts down Maple. A sudden power failure, would not have time to do that. I know from using Solidworks, the settings etc are not saved until the one exits and restarts the program. So if one has changed some settings and then a crash they are lost. 

eliminating pairs...

Ronan 1396
December 31 2024
0 0

I tried  eliminating pairs [x,y] ,[ x,z] and [y,z]. That doesnt give a consistant answer though but maybe it will shed some light on the issue.

> 

restart;
> 

expr1:=a^2  =4*y*z/((x + y)*(x + z))
> 

 

a^2 = 4*y*z/((x+y)*(x+z))

 (1)
> 

expr2:=b^2= 4*z*x/((y + z)*(y + x))

b^2 = 4*z*x/((y+z)*(x+y))

 (2)
> 

expr3:=c^2= 4*x*y/((z + x)*(z + y))

c^2 = 4*x*y/((x+z)*(y+z))

 (3)
> 

elm1:=eliminate({expr1,expr2,expr3},[x,y])

[{x = -z*(a^2*c^2-2*a^2-2*b^2-2*c^2+8)/(a^2*c^2-4*a^2), y = (a^2-b^2-c^2+4)*(a^2*c^2-2*a^2-2*b^2-2*c^2+8)*z/(a^2*(a^2-b^2+c^2-4)*(c^2-4))}, {(a-2)*(a+2)*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}]

 (4)
> 

elm2:=eliminate({expr1,expr2,expr3},[x,z])

[{x = -y*(a^2*b^2-2*a^2-2*b^2-2*c^2+8)/(a^2*b^2-4*a^2), z = b^2*y*(a^2-b^2-c^2+4)/(a^2*b^2+b^4+b^2*c^2-4*a^2-8*b^2-4*c^2+16)}, {(a-2)*(a+2)*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}]

 (5)
> 

elm3:=eliminate({expr1,expr2,expr3},[y,z])

[{y = -a^2*x*(a^2+b^2-c^2-4)/(a^4+a^2*b^2+a^2*c^2-8*a^2-4*b^2-4*c^2+16), z = x*(a^2*c^2-2*a^2-2*b^2-2*c^2+8)/(-a^2*c^2+4*c^2)}, {a*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}]

 (6)
> 

elm1[2]-elm2[2]

{(a-2)*(a+2)*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}-{(a-2)*(a+2)*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}

 (7)
> 

simplify( (7) );

0

 (8)
> 

elm1[2]-elm3[2]

{(a-2)*(a+2)*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}-{a*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}

 (9)
> 

simplify( (9) );

{(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)*(a^2-4)}-{a*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}

 (10)
> 

elm2[2]-elm3[2]

{(a-2)*(a+2)*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}-{a*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}

 (11)
> 

simplify( (11) );

{(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)*(a^2-4)}-{a*(a*b*c+a^2+b^2+c^2-4)*(-a*b*c+a^2+b^2+c^2-4)}

 (12)
 

 

Download 2024-21-31_eliminate_test.mw

That works very well...

Ronan 1396
December 30 2024
0 0

@acer  Yes SetMetric is a good way of avoiding accidently changing the Metric. Why use Metric:=copy(M) instead of Metric:=M?

Oh Dear... That is a problem...

Ronan 1396
December 30 2024
0 0

@nm I was completly unaware of option object. This is a level of coding I have never come across. I know I didn't state this  or put it in the example given. I am using option package which it turns out can't be used with object.  When I put my example together, I thought, "I don't need that for this question".

I need to have a default value for the Metric matrix when the package is loaded. Can the object concept be used  inside a package? Is there any other way in this case? 

Globals may be bad, but I have used quite a few of them. I admit my thinking may be limited.


 

Neat...

Ronan 1396
December 29 2024
0 0

@Joe Riel  I like that. Both comments (now answers ) are helpful to know.

Ahh......

Ronan 1396
December 29 2024
0 0

@Joe Riel Thanks. Had tried with no forward quotes at all previously. I find it rather subtle when to use and not to use them.

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