Entering,

kernelopts(opaquemodules=false):

will subsequently allow those showstat() or eval() calls to access that non-exported local member SendRequest of the HTTP module.

acer

Entering,

kernelopts(opaquemodules=false):

will subsequently allow those showstat() or eval() calls to access that non-exported local member SendRequest of the HTTP module.

acer

Hi Alec,

How should quality control be managed?

For example, I believe that this pair of paragraphs on this page are not correct.

"Only two possibilities exist: either a variable is local to the one procedure which it immediately occurs in, or it is global to the entire Maple session. Local variables are local only to their own procedure. They are not known in other procedures, even within procedures which appear within the procedure which defines them.

If you do not declare your variables to be global or local, Maple decides for you. If a variable appears on the left-hand side of an explicit assignment, then Maple assumes that you intend the variable to be local. Otherwise , Maple assumes than the variable is global to the whole session."

As I interpret those paragraphs, they are both contradicted by the following example,

For example,

> restart:

> x := 17:

> f := proc()
> local x, g;
>    g := proc()
>    local t:
>       t := x:
>       print(t);
>    end proc:
>    x := 13:
>    g();
> end proc:

> f();
                                      13

Upon reading the section "Implicit Local Variables" of the ?proc help-page it becomes more clear that the actual situation in Maple is at odds with the paragraphs above in several ways.

I'm not trying to pick on this entry in particular. I am wondering how to best manage feedback and discussion. Should the wiki have a discussion page for each information page? (I didn't see one. Sorry if I missed it.)

acer

kernelopts(opaquemodules=false):
eval(HTTP:-SendRequest);

acer

"Man is the measure of all things: of those which are, that they are, and of those which are not, that they are not"            -- Tag the mag'

kernelopts(opaquemodules=false):
eval(HTTP:-SendRequest);

acer

"Man is the measure of all things: of those which are, that they are, and of those which are not, that they are not"            -- Tag the mag'

That's a interesting view, Doug. (I realize that it's a suggestion for a possible interpretation, and may not be what you yourself hold fast to.) But doesn't it describe the opposite state of affairs from what Maple does now?

I might make another suggestion on how to interpret such problems: in both cases the integrand (or antiderivative) must be evaluated at floating-point values. So numeric stability is desired. Numeric quadrature routines are often designed with that goal in mind. (Simple example: spurious nonzero imaginary artefacts seem to quite often occur when evaluating exact antiderivatives at approximate values under fixed precision, while numeric quadrature might produce strictly real evaluations.) So maybe Maple should do numeric quadrature in both situations originally posted above.

acer

What happens if you split the integral, making assumptions a>0,a<2 for one part and a>2 for the other? And then use eval() instead of subs()?

acer

Here's an experiment. Open a new Worksheet (not Document). Toggle to 1-D Maple Notation input (not 2D Math input) using either the keyboard shortcut or with the menubar's Tools -> Options -> Display(tab) -> Input display . I realize that those might be different on OSX. You'll know it's right if you can get the red cursor and red input.

Now, enter this,

eval(plot);

Did that print out the body of the plot() procedure? Can you issue the command

plot(2*x-9, x = -10 .. 10);

from that same worksheet, by typing it in and not using context-menus and the mouse?

I'm just trying to see whether all plotting is not working, or just the plot command, or context-menu results, or...

Do other typed commands work OK, like int(sin(x),x) ?

acer

Here's an experiment. Open a new Worksheet (not Document). Toggle to 1-D Maple Notation input (not 2D Math input) using either the keyboard shortcut or with the menubar's Tools -> Options -> Display(tab) -> Input display . I realize that those might be different on OSX. You'll know it's right if you can get the red cursor and red input.

Now, enter this,

eval(plot);

Did that print out the body of the plot() procedure? Can you issue the command

plot(2*x-9, x = -10 .. 10);

from that same worksheet, by typing it in and not using context-menus and the mouse?

I'm just trying to see whether all plotting is not working, or just the plot command, or context-menu results, or...

Do other typed commands work OK, like int(sin(x),x) ?

acer

This is the so-called 2-D Math parser in action.

You can set a new default using the top-menubar's Options -> Display -> "Input display". You can set that drop-down choice to the old 1-D "Maple Notation" value. I also have set the default  Options -> Interface -> "Default format for new worksheets" to be Worksheet rather than Document. Together those two changes should make the Standard GUI act more like you are used to. You can choose "Apply Globally" if you want to set it thus for all future sessions.

I'm curious, when you entered 5/7*3 did you see it represented as a fraction, 5 over 7 dot 3 ?

acer

I forgot about that. Brilliant. Thanks, Robert.

It does pretty much exactly what my code above does. (Like my code, it too overwrites the orginal Matrix with the superimposed L and U factors.) And so determinant of a 6000x6000 nonsparse float[8] takes 280MB -- pretty much the memory only to hold the Matrix itself.

So the original poster could just ensure that the Matrix is created with datatype=float[8], and not with storage=sparse, and then do your LUDecomposition call above.

acer

I forgot about that. Brilliant. Thanks, Robert.

It does pretty much exactly what my code above does. (Like my code, it too overwrites the orginal Matrix with the superimposed L and U factors.) And so determinant of a 6000x6000 nonsparse float[8] takes 280MB -- pretty much the memory only to hold the Matrix itself.

So the original poster could just ensure that the Matrix is created with datatype=float[8], and not with storage=sparse, and then do your LUDecomposition call above.

acer

I do not know why there may be a memory restriction on your machine. What operating system is it?

acer

I do not know why there may be a memory restriction on your machine. What operating system is it?

acer

I wish that all Maple manuals could be written as well as this was.

acer