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Anthrazit

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7 years, 36 days
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These are questions asked by Anthrazit

Plotting multiple items...

Anthrazit 935 Maple
embedded-components plotting
November 02 2021
1 0

Are there any examples showing how to plot multiple items in one plot?

  • What I have started with is to put a Plot component in my sheet, so that I can use that by its name.
  • Next thing on the list was to generate different plot objects, by assigning each of them to a variable.
  • To plot the whole bunch, I collected all the items I want to plot in a list
  • And plotted them by SetProperty("MyPlotcomponent", value, display(plotlist))

I wonder if this is the best way to do it. Especially when adding more stuff afterwards, would it be possible to just add something to the plot component?

Do I need plot components at all?

Copy values of mutable content...

Anthrazit 935 Maple
vector copy mutable
November 01 2021
3 9

What's the correct way of copying the current contents of a mutable object to a variable.

Apparently eval doesn't do the job.

aVectorList := [Vector(2, [1, 2]), Vector(2, [3, 2])]

[Vector[column](%id = 36893489518525866940), Vector[column](%id = 36893489518525867060)]

 (1)

results := []

[]

 (2)

AddVector := Vector(4)NULL

Vector[column](%id = 36893489518525846460)

 (3)
> 

for x in aVectorList do AddVector[1] := x[1]; AddVector[2] := x[2]; results := [op(results), AddVector] end do

AddVector[1] := 1

  

AddVector[2] := 2

  

[Vector(4, {(1) = 1, (2) = 2, (3) = 0, (4) = 0})]

  

AddVector[1] := 3

  

AddVector[2] := 2

  

[Vector[column](%id = 36893489518525846460), Vector[column](%id = 36893489518525846460)]

 (4)

NULL

results := []

[]

 (5)

AddVector := Vector(4)NULL

Vector[column](%id = 36893489518525840668)

 (6)

NULL

> 

for x in aVectorList do AddVector[1] := eval(x[1]); AddVector[2] := eval(x[2]); results := [op(results), AddVector] end do

AddVector[1] := 1

  

AddVector[2] := 2

  

[Vector(4, {(1) = 1, (2) = 2, (3) = 0, (4) = 0})]

  

AddVector[1] := 3

  

AddVector[2] := 2

  

[Vector[column](%id = 36893489518525840668), Vector[column](%id = 36893489518525840668)]

 (7)

NULL

Download Mutable.mw

Convert list with vectors to set...

Anthrazit 935 Maple
set list
October 28 2021
2 2

When converting a list which includes lists to a set, duplicate entries are dropped.

However converting a list with vectors to a set, no duplicate entries are dropped.

Any explanation to that behaviour?

a := {Vector(2, [1, 0]), Vector(2, [2, 0])}

{Vector[column](%id = 36893490347685388884), Vector[column](%id = 36893490347685389004)}

 (1)

b := [Vector(2, [1, 0]), Vector(2, [2, 0]), Vector(2, [1, 0])]

[Vector[column](%id = 36893490347747359308), Vector[column](%id = 36893490347747359428), Vector[column](%id = 36893490347747359548)]

 (2)

c := convert(b, set)

{Vector[column](%id = 36893490347747359308), Vector[column](%id = 36893490347747359428), Vector[column](%id = 36893490347747359548)}

 (3)

d := [[1, 0], [2, 0], [1, 0]]``

[[1, 0], [2, 0], [1, 0]]

 (4)

e := convert(d, set)

{[1, 0], [2, 0]}

 (5)

``

Download DuplicateEntries.mw

Error on save of workbook...

Anthrazit 935 Maple
workbook save incomplete-question
September 06 2021
0 2

I'm getting a strange error today when trying to save a file on the network. Rebootet machine, no change.

Any hints?

Local vs. global variables ?...

Anthrazit 935 Maple
programming global local
August 13 2021
1 2

Can someone tell me why there is a difference between global and local variables in this code?

...cannot determine if this expression is true or false

GlobalLocal.mw

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