Annoying: PutMatDat does not work inside For...

[jimarin]

Estimated colleagues,

the recipe to reproduce this (most annoying) bug:

Create a file whose content is:

Matrix GlMat = Col(1,2,3,4,5,6);
Set For(1, 6, Real(Real ThN){

Real PutMatDat(GlMat, ThN, 1, 6-ThN+1)

});

Tell tol to compile the file. The matrix is untouched.

The funny thing is that if you do put the given lines into the eval console tol
does it.

I would say that reassigning matrix elements inside loops is something that
could be very useful to most analyst, that is the reason I marked this bug as
being major.

Thanks in advance for being there.

jima

[danirus]

Hi Jima, I've checked it and it's a Tolbase bug.
You can also check it with Tol Console (based on ncurses).
Cheers.

[jimarin]

Ok, I wait for the tolbase team to keep me updated then.

Thanks !

jima

[jimarin]

Hmmm, perhaps I forgot... my tol version dates from 20th of February of 2006.

This might be of importance I guess.

Thanks.

jima

[danirus]

Hi Jima,

Part of the behavior you have shown here can not be considered a Bug, due to the
Lazy property of Tol.

Bye

[jimarin]

Ok, but...then...

what should I do to force Tol to work and forget its lazy mood for a while?

jima

[Jorge]

Hi Jima, you can write something like this:

Matrix GlMat = Col(1,2,3,4,5,6);
Set For(1, 6, Real(Real ThN){

Real Do(PutMatDat(GlMat, ThN, 1, 6-ThN+1))

});

note the use of "Do" forcing the evaluation of PutMatDat

Also the Real objects in TOL are not Lazy, so if a Real object has name then it
is evaluated when created.

In the initial code each result of the For is a Real object without name. If
you write the code this other way:

Matrix GlMat = Col(1,2,3,4,5,6);
Set For(1, 6, Real(Real ThN){

Real res = PutMatDat(GlMat, ThN, 1, 6-ThN+1)

});

you will fore also the evaluation of the Real objects.

If, with the initial code, you inspect the result of the Set then each PutMatDat
is executed and as a result the object GlMat is changed, but this an effect I
don't like.

best regards,

Jorge

[jimarin]

Thanks.

Will try and comment.

jima