Ronan

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8 years, 199 days
East Grinstead, United Kingdom

MaplePrimes Activity


These are replies submitted by Ronan

Hello, I only palyed with MapleSim a few years ago, so can't answer your specific question. Try this link.

https://www.youtube.com/c/maplesoft/playlists  There are several series on MapleSim.

Hope this helps.

@janhardo with the abs in the Maple equation the answer came out negative. I dont know how abs reacts in the fsolve command.

I notice your arctan functions have Pi/90. Have you set GE to working degrees? Radians are better for for general problem solving. That is throwing your equation for solving in Maple.

@janhardo Thanks for that. I checked it out. All I had to do was remove the absolute value from the Area equation after pasting it into Maple.

restart

`` ``

A2 := (-R^2+4*r^2)^(1/2)*R*(-1/2)+arctan((-R^2+4*r^2)^(1/2)/R)*R^2-arctan((-R^2+4*r^2)^(1/2)*R/(R^2-2*r^2))*r^2

-(1/2)*(-R^2+4*r^2)^(1/2)*R+arctan((-R^2+4*r^2)^(1/2)/R)*R^2-arctan((-R^2+4*r^2)^(1/2)*R/(R^2-2*r^2))*r^2

(1)

``

r := 1

1

(2)

A2

-(1/2)*(-R^2+4)^(1/2)*R+arctan((-R^2+4)^(1/2)/R)*R^2-arctan((-R^2+4)^(1/2)*R/(R^2-2))

(3)

fsolve(A2 = (1/2)*Pi*r^2, R)

1.158728473

(4)

``

``


 

Download GE_Circle_puzzle.mw

 

Hello,

A bit of a side line question here. I got a copy of GE the other day as it is on special offer .How did you make the overlapping area of the circles?

Read this from 2015. @ecterrab  would know if further developments have been implimented along this line.

https://www.mapleprimes.com/questions/205246-How-To-Use-Matrix-Symbol-Directly-In

 

@vv Thank you. I was not aware of msolve.

@Carl Love Originally I didn't think there would be so many solutions. So that idea went in the bin. Your line of code could will work really well.

 

@Kitonum Thank you. I didnt realise there would be 4000 solutions. 

 Something similar happened  around the start of the year. I suggested then that if a member with some level of status reples the OP should not be allowed without permission to delete the question.

https://www.mapleprimes.com/questions/226210-Disappearing-Questions#comment255592

 

@acer This is just an example for the question. I picked an arbitrary way of making large numbers and then extracting the data I want. I did try  a billion elements:- no hope ran all night on part 1 of your code. I have been wondering about what one would do with larger arrays. But that is not the immediate concern. It would be interesting to see how this runs on a a processor with say 16+ physical cores expecially a Ryzen.

@acer  I am using an I7-7700 4.8Ghz 64G ram on Win10. Maple 2019.0. For some reason I can't upload the maple files so it is pdfs.

I am aware of the timing variations you mentioned.

threadthingm_10million.pdf

 

threadthingm_100million.pdf

I like Threads:-Seq because it is simple for me to understand.

 

@tomleslie Sorry for the delay in replying to you.

Attached is a pdf of the worksheet run for 100million. 430secs parallel.!!!!

Lately I cant seem to upload maple documents. Just get a failed message.

 

 

speedUP4-1.pdf

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