casperyc

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16 years, 35 days
University of Kent
Dr

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These are questions asked by casperyc

The Warning:

1st Vector dimension size (1..9) is too small to fit source size (1..14)

 

This come from a really long procedure that I have written. With lots of commands from LinearAlgebra package.

Is there a way to find out what exactly went wrong?

 

It's not informative in a way, i can't exactly identify where this is coming from...

 

I also wonder if it could have come from "pdesolve"...

restart:

with(LinearAlgebra):
with(ArrayTools):


k:=4;
pA:=<seq(p[a,i],i=2..(k+1))>;
pB:=<seq(p[b,i],i=2..(k+1))>;
pA+pB;

with(VectorCalculus):

pA:=<seq(p[a,i],i=2..(k+1))>;
pB:=<seq(p[b,i],i=2..(k+1))>;
pA+pB;

 

Hi all,

 

After I loaded the package with(VectorCalculus), the output of vectors changed to a different one.

Is there any real "difference" when...

restart:
with(ArrayTools):
m:=<1,2,3,4|3,2,1,0|x,y,z,z0|a,a,a,a|b,b,b,b>;
lscol:=<seq(1-AddAlongDimension(m,2)[i],i=1..4)>;
m:=<m|lscol>;
UpperTriangle(m);

Hi all,

I wonder if there is a way to extract the upper/lower triangle entries from a matrix?

Basically, I want to creat a column vector of the none zero entries in "UpperTriangle(m);"

 

Also, aside, is there a way to quickly assign those entries...

myf:=(mu,sigma)->int(exp(-(x-mu)^2/2/sigma^2)/sigma/sqrt(2*Pi)/(1+exp(-x)),x=-infinity..infinity);

plot3d('myf(mu,sigma)',mu=-5..5,sigma=0.5..10);

This plot was never created. I think it's taking too long to evaluate it when it's divegent.

 

Hi all,

For my research purpose, I need to integrate this function. I understand that there maybe values for which this integration is divegent. But is there a way to look into it? Say creat...

Hi all,

I am now helping with the first year maple session in my university. Recently, some of the student are learning both 1-d and 2-d input.

Now we have something like this:

 

Is this some sort of bug?

I know it has something to do with the 1-d or 2-d or math input, but in short, that's what happens.

Thanks!

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