casperyc

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13 years, 264 days

MaplePrimes Activity


These are questions asked by casperyc

At the moment, I am using

>writeto("Result1.txt");

> printf(StringTools[FormatTime]("%c\n"));
Thu Jul 31 14:28:08 2014

# lots of things here

# lots of things here

# lots of things here

>writeto(terminal);

To write a time and date stamp into my result1.txt file.

I understand that I can't write : into file names, but is there a way to writeto file using a more informative file name with date and time, such as,

Result_Thu Jul 31 14-28-08 2014.txt

 

Is that something can be easily formatted?

casper

 

Say sometimes, I need to copy and paste results from Maple output, either in 1D or 2D or self formatted (see this).

Sometimes, it works fine, with just a single ">" sign, like this

> v1:=[
eta[p2] = 0.260 ,
eta[p3] = 0.113 ,
eta[p4] = -0.013 ,
eta[p5] = 0.215 ,
eta[p6] = -0.189 ,
eta[phi2] = 0.020 ,
.......ect
]:

 

But sometimes, it looks like this:

 

> v1:=[
> eta[p2] = 0.260 ,
> eta[p3] = 0.113 ,
> eta[p4] = -0.013 ,
> eta[p5] = 0.215 ,
> eta[p6] = -0.189 ,
> eta[phi2] = 0.020 ,
> .......ect
> ]:

 

Below is a screenshot from what I get when I copy the above synatex into Maple :

 

Personally, when I type in multiple synatex, I tend to use shift+enter, to avoid the use of many ">"s.

 

It does not have any effect in practice, but is there a way to improve this? I dont like seeing many many ">"s.

restart:

a:=0.0000000000000000000000213123123;

evalf[3](a);

I think the above is the same as if I were to change the precision tab, to display 3 decimals.

Is there a way to ask Maple to display it as  (printf(  "%3.3f",a);)

0.000

But I want this as a standard Maple ouput.

and I am not just working with a single scalar, I need something that works for a Vector, Matrix, and perhaps, in general.

 

Thanks,

 

casper

v1:=[
eta[p2] = 0.260 ,
eta[p3] = 0.113 ,
eta[p4] = -0.013 ,
eta[p5] = 0.215 ,
eta[p6] = -0.189 ,
eta[phi2] = 0.020 ,
eta[phi3] = 0.063 ,
eta[phi4] = -0.014 ,
eta[phi5] = -0.414 ,
eta[phi6] = 0.067 ,
mu[p] = 0.466 ,
mu[phi] = -0.169 ,
tau[p3] = -0.000 ,
tau[p4] = 0.000 ,
w[1] = 0.023 ,
w[2] = -0.447 ,
w[3] = -0.110 ,
w[4] = 0.035 ,
w[5] = 0.445
]:

for i to numelems(v1) do
    printf("%a = %3.3f , \n",lhs(v1[i]),rhs(v1[i]));
end do:

This runs and returns:

eta[p2] = 0.260 ,
eta[p3] = 0.113 ,
eta[p4] = -0.013 ,
eta[p5] = 0.215 ,
eta[p6] = -0.189 ,
eta[phi2] = 0.020 ,
eta[phi3] = 0.063 ,
eta[phi4] = -0.014 ,
eta[phi5] = -0.414 ,
eta[phi6] = 0.067 ,
mu[p] = 0.466 ,
mu[phi] = -0.169 ,
tau[p3] = 0.000 ,
tau[p4] = 0.000 ,
w[1] = 0.023 ,
w[2] = -0.447 ,
w[3] = -0.110 ,
w[4] = 0.035 ,
w[5] = 0.445 ,

 

Is there a way to align the qual signs? also to align the decials like this:

 

eta[p2]   =  0.260 ,
eta[p3]   =  0.113 ,
eta[p4]   = -0.013 ,
eta[p5]   =  0.215 ,
eta[p6]   = -0.189 ,
eta[phi2] =  0.020 ,
eta[phi3] =  0.063 ,
eta[phi4] = -0.014 ,
eta[phi5] = -0.414 ,
eta[phi6] =  0.067 ,
mu[p]     =  0.466 ,
mu[phi]   = -0.169 ,
tau[p3]   =   0.000 ,
tau[p4]   =   0.000 ,
w[1]       =   0.023 ,
w[2]       = -0.447 ,
w[3]       = -0.110 ,
w[4]       =  0.035 ,
w[5]       =  0.445 ,

For the negative numbers, I prefer to have 1 space of indentation.

 

Thanks,

 

casper

a:=Vector([2,3,4,5]);

select[flatten](x->x>=3,a);

This returns a Vector that satisfies the above condition. What's the most efficient way to get the indices of those entries?

For example, a list l:=[2,3,4] that correspond to the a[l] entries that satisfies the above condition.

l:=[2,3,4];

a[l]; # gives the same answer

 

Thanks,

 

casper

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