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Offline omorr  
#121 Posted : 25 May 2013 00:33:52(UTC)
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First and second order ODE examples.



I do not know how to solve them in one step like. How to put sets - {} in the command?

>dsolve({D(y)(x)=x-y,y(0)=1},y(x))

Could someone give some help?

Regards,
Radovan
File Attachment(s):
ode1.sm (10kb) downloaded 56 time(s).
ode2.sm (14kb) downloaded 55 time(s).
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"
Offline uni  
#122 Posted : 25 May 2013 02:54:08(UTC)
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Updated. The document can not be saved. I don't know why.

plot([`in`[1], `in`[2], t=0..2*Pi], color=blue );

plot3d( `in`, x=-5..5, y=-5..5, scaling=constrained, style=patch,
orientation=[40,50], grid=[50,50], color=gray, axes=frame,
lightmodel=`light4`, projection=`normal`, shading=zgrayscale );

implicitplot3d( `in`=0, x=-2..2, y=-2..2, z=-2..2, grid=[50,50,50], orientation=[20,60],
axes=frame, lightmodel=`light4`, projection=`normal`, style=patchnogrid);



F:=implicitplot3d( `in`[1]=0, x=-2..2, y=-2..2, z=-2..2, grid=[30,30,30],
style=patchnogrid ):

G:=plot3d(`in`[2], x=-2..2, y=-2..2, style=patch, color=white):

display({F,G}, orientation=[20,60], axes=box, lightmodel=`light2`,
projection=`normal`, labels=["X","Y","Z"], scaling=constrained,
tickmarks=[4,4,4] );




f(x;y;z)Sada^2*(x^2+y^2+z^2))^{-2}+(b^8*(x^8+y^8+z^8))^4-2

F:=implicitplot3d( `in`=0, x=-2.1..2.1, y=-2.1..2.1, z=-2.1..2.1,
grid=[50,50,50], style=patchnogrid ):

display({F}, orientation=[35,55], axes=box, lightmodel=`light4`,
projection=`normal`, labels=["X","Y","Z"], scaling=constrained,
tickmarks=[4,4,4] );

Edited by user 25 May 2013 08:22:58(UTC)  | Reason: Not specified

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Offline uni  
#123 Posted : 25 May 2013 10:50:17(UTC)
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Originally Posted by: omorr Go to Quoted Post
I do not know how to solve them in one step like. How to put sets - {} in the command?

>dsolve({D(y)(x)=x-y,y(0)=1},y(x))

Could someone give some help?


Edited by user 25 May 2013 11:53:03(UTC)  | Reason: Not specified

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Offline omorr  
#124 Posted : 25 May 2013 12:52:17(UTC)
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Aha,...convert() was the magic word. Thank you Good
Strange, but this one was the only one successful



My other attempts in making plots and reproducing your pictures, issued an error about missing gif file in tmp folder. See the picture please



The problem of not saving pictures and SMat crash still remained.

Regards,
Radovan
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"
Offline uni  
#125 Posted : 25 May 2013 13:08:25(UTC)
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Show me the log file: mvr5.txt.
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Offline omorr  
#126 Posted : 25 May 2013 13:19:05(UTC)
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Originally Posted by: uni Go to Quoted Post
Show me the log file: mvr5.txt.

Here it is. If you want me something in particular to try, just let me know.

Regards,
Radovan

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Offline omorr  
#127 Posted : 25 May 2013 13:40:59(UTC)
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This one is after deleting mvr5.txt and trying to make a parametric 3dplot

Edited by user 25 May 2013 13:42:45(UTC)  | Reason: Not specified

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omorr attached the following image(s):
3dplotparam.png
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Offline uni  
#128 Posted : 25 May 2013 13:59:09(UTC)
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Originally Posted by: omorr Go to Quoted Post
Originally Posted by: uni Go to Quoted Post
Show me the log file: mvr5.txt.

Here it is. If you want me something in particular to try, just let me know.

Regards,
Radovan

Radovan, you have to change the maple-commands for each graph. In your example these commands are set incorrectly. I specifically show the commands. They need to be inserted into the settings form, as showed above.

1) Try this:

a := plot( `in`, t=0..20, x=-1.5..1.5, scaling=unconstrained, style=line,
color=blue, axes=box, labels=["t","x(t) "]):

b := coordplot(rectangular, [0..20, -1.5..1.5], linestyle=[7,7],
color=[gray,gray]):

display([a,b]);

2) projection=`normal must be projection=`normal`

Edited by user 25 May 2013 14:11:28(UTC)  | Reason: Not specified

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Offline omorr  
#129 Posted : 25 May 2013 15:04:10(UTC)
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I tried your suggestion (just copy/paste) and calculation take quite long (did not wait for it to finish). Just used the simple one, and it worked (the first picture). It is good enough for me Good .

Tried one of your examples, and typed carefully as much as I could. I did not see any mistake - but the plot did not appear (the second picture) Sad



Regards,
Radovan

Edited by user 25 May 2013 15:07:03(UTC)  | Reason: Not specified

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Offline uni  
#130 Posted : 25 May 2013 15:14:41(UTC)
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Try to add with(plots): to with.inc:
Quote:
with(linalg):with(inttrans):with(plots):
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Offline omorr  
#131 Posted : 25 May 2013 15:26:25(UTC)
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Originally Posted by: uni Go to Quoted Post
Try to add with(plots): to with.inc:
Quote:
with(linalg):with(inttrans):with(plots):


It worked Good . What was the catch?
omorr attached the following image(s):
3dplot-implicit.png
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Offline omorr  
#132 Posted : 25 May 2013 19:26:54(UTC)
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Nice Good



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ode2-boundary.sm (19kb) downloaded 67 time(s).
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Offline uni  
#133 Posted : 26 May 2013 02:40:31(UTC)
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MaplePlot updated. Small imprоvements.

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Offline omorr  
#134 Posted : 26 May 2013 09:59:31(UTC)
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Just to confirm. The EMPTY PLOT is now working fine. No crash of SMath at the plot inserting Good


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Offline sija  
#135 Posted : 26 May 2013 11:20:20(UTC)
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Hello,

Heartily please for the prompt, how to check in Maple that two expressions are to themselves equal. For example whether the expression under variable a is such alone as the expression under variable b?

Regards,
Janusz
Offline omorr  
#136 Posted : 26 May 2013 13:26:32(UTC)
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Originally Posted by: sija Go to Quoted Post
Heartily please for the prompt, how to check in Maple that two expressions are to themselves equal. For example whether the expression under variable a is such alone as the expression under variable b?

I do not use maple to much (it is interesting and a fun using it in SMathGood ) , and someone else might give you a better solution - but this should work

e1Sada^2-1)*1/sqrt(a)

e2Sadb-1)*(b+1)/sqrt(Cool

maple(simplify(subs(a≡b,e1)-e2))=0

Regards,
Radoavn
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Offline sija  
#137 Posted : 26 May 2013 14:32:54(UTC)
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Hi Radoavn,

Thank you, interesting solution, will try out it.

Regards,
Janusz
Offline uni  
#138 Posted : 27 May 2013 08:10:51(UTC)
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Updated. Still can't save region.



File Attachment(s):
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Offline mkraska  
#139 Posted : 27 May 2013 09:22:01(UTC)
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Thanks for the update.

I have still trouble with the basics. Example 2 does not work.

Here is what the log file says:


There are empty tmp files in the tmp dir:
tmp59BF.tmp
tmp5A0F.tmp
Martin Kraska

Pre-configured portable distribution of SMath Studio: https://en.smath.info/wi...th%20with%20Plugins.ashx
Offline uni  
#140 Posted : 27 May 2013 10:07:10(UTC)
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In your example:
`in`Sadx^2+y^2+z^2)-1

but expected:

sys(el(`in`;1);el(`in`;2);2;1):sys((x^2+y^2+z^2)-1;0;2;1)

we get: `in`[1]="" , `in`[2]="" - empty values (because it is not a system) and `in`=(x^2+y^2+z^2)-1 (but is missing in script)

Must be:




Quote:
There are empty tmp files in the tmp dir:
tmp59BF.tmp
tmp5A0F.tmp
This is normal.

Edited by user 27 May 2013 10:11:12(UTC)  | Reason: Not specified

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