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mhk

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16 years, 2 days
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"Sum" vs "sum"...

mhk 12
December 03 2009
0 0

Thanks djc

The "with student" was partly the trick.

But the result also depends on whether you expand a "sum" or a "Sum".

"with student" AND "Sum" works as I would like it to.

The expansion of "sum"  is strange both with and without "student".

Try this:
> restart;

> sum((x[i]-k)^2, i = 1 .. n);
> expand(%);
> Sum((x[i]-k)^2, i = 1 .. n);
> expand(%);

> with(student);
> sum((x[i]-k)^2, i = 1 .. n);
> expand(%);
> Sum((x[i]-k)^2, i = 1 .. n);
> expand(%);

Unfortunately "sum" is what you get when you are using the GUI's "expression" tool for sum.

Life is not easy for a newbie. But who says it should be ?

 

Morten
 

 

"Sum" vs "sum"...

mhk 12
December 03 2009

Thanks djc

The "with student" was partly the trick.

But the result also depends on whether you expand a "sum" or a "Sum".

"with student" AND "Sum" works as I would like it to.

The expansion of "sum"  is strange both with and without "student".

Try this:
> restart;

> sum((x[i]-k)^2, i = 1 .. n);
> expand(%);
> Sum((x[i]-k)^2, i = 1 .. n);
> expand(%);

> with(student);
> sum((x[i]-k)^2, i = 1 .. n);
> expand(%);
> Sum((x[i]-k)^2, i = 1 .. n);
> expand(%);

Unfortunately "sum" is what you get when you are using the GUI's "expression" tool for sum.

Life is not easy for a newbie. But who says it should be ?

 

Morten
 

 

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