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mehdi jafari

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12 years, 96 days
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These are questions asked by mehdi jafari

problem with select ?...

mehdi jafari 774
order
June 06 2014
3 6

hi everyone,i have two questions,
1. i have a problem with select command? 

> 

restart:
> 

eq[1]:=diff(a[1](x),x$2)+diff(a[1](x),x$1)*diff(a[2](x),x$1)+diff(a[1](x),x$2)*diff(a[2](x),x$2)+diff(a[3](x),x$1)+diff(a[1](x),x$1)*diff(a[2](x),x$2)+diff(a[1](x),x$2)*diff(a[3](x),x$1);

diff(diff(a[1](x), x), x)+(diff(a[1](x), x))*(diff(a[2](x), x))+(diff(diff(a[1](x), x), x))*(diff(diff(a[2](x), x), x))+diff(a[3](x), x)+(diff(a[1](x), x))*(diff(diff(a[2](x), x), x))+(diff(diff(a[1](x), x), x))*(diff(a[3](x), x))

 (1)
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# how can i select the differentials which are of second order ? without using the function names , for example i do not want to use this :
> 

select(has,eq[1],[seq](diff(a[i](x),x$2),i=1..3));

diff(diff(a[1](x), x), x)+(diff(diff(a[1](x), x), x))*(diff(diff(a[2](x), x), x))+(diff(a[1](x), x))*(diff(diff(a[2](x), x), x))+(diff(diff(a[1](x), x), x))*(diff(a[3](x), x))

 (2)
> 

#i just want maple to select the second order differentials,without knowing its name # just beacuse it is of second order,how can i do this !?

2. how i can select the parts which their addition of differential oreder,are the same ? for example,the second expression in eq[1] has the addition order of 2,third has 4 and ... how can isolate addition order ? tnx in advance . 

Download select.mw

using parallel CPU's...

mehdi jafari 774
grid toolbox
May 21 2014
1 0

i have a corei7 laptop and i want maple to use all of my cpu cores in paraller,what should i do exactly ? in there anyway to use them without using grid computing toolbox ? or how to manage it with grid computing toolbox? i want maple use all of my cpu power during computation, tnx for help 

another interesting bug in mapleprimes, when i created new tage , i face this error : 

Only users with at least 250 reputation can create new tags, please remove or replace these tags: computing !
i have 305 but i could not do it ! :| .

error generating page when uploading fil...

mehdi jafari 774
April 20 2014
0 5

hi,i can not upload anything to mapleprimes.com every time i want to upload a file, i face error generating page . what should i do ?! 

problem with plot...

mehdi jafari 774
plot pointplot
April 04 2014
1 0

i have a list of data, i can plot them with point plot,but i can not plot it in line style not point, could anyone help ? tnx for your help. 

what is the best maple book?...

mehdi jafari 774
books
March 24 2014
2 2

what is the best maple book? could every one introduce books which have studied about maple !?? which is the best due to everyones opinion ? tnx for answering.

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