Having just graduated from Maple 9.5 to Maple 2016.2 I am flummoxed by
the simplify command. My expression includes square roots, and all I get
from simplify is "`simplify/sqrt/product` uses a 2nd argument, n, which
is missing" which is of no help at all. One would think it would use the
old simplfy procedure (eg assuming positivee argument and positive
result by default, or something like that).
Looking at the help page and putting in
simplify(%,assume=positive) just give the same response.
If simplify is simply going to throw up its hands in despair every time
it runs across something slightly out of the ordinary, it makes it
pretty useless.

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In article <omg0fv$u3k$[email protected]>, William Unruh
<[email protected]> wrote:

Having just graduated from Maple 9.5 to Maple 2016.2 I am flummoxed by
the simplify command. My expression includes square roots, and all I get
from simplify is "`simplify/sqrt/product` uses a 2nd argument, n, which
is missing" which is of no help at all. One would think it would use the
old simplfy procedure (eg assuming positivee argument and positive
result by default, or something like that).
Looking at the help page and putting in
simplify(%,assume=positive) just give the same response.
If simplify is simply going to throw up its hands in despair every time
it runs across something slightly out of the ordinary, it makes it
pretty useless.

Why not give us an example where you get this message?

--
G. A. Edgar http://www.math.ohio-state.edu/~edgar/

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On 2017-08-11, G. A. Edgar <[email protected]d> wrote:

In article <omg0fv$u3k$[email protected]>, William Unruh
<[email protected]> wrote:

Having just graduated from Maple 9.5 to Maple 2016.2 I am flummoxed by
the simplify command. My expression includes square roots, and all I get
from simplify is "`simplify/sqrt/product` uses a 2nd argument, n, which
is missing" which is of no help at all. One would think it would use the
old simplfy procedure (eg assuming positivee argument and positive
result by default, or something like that).
Looking at the help page and putting in
simplify(%,assume=positive) just give the same response.
If simplify is simply going to throw up its hands in despair every time
it runs across something slightly out of the ordinary, it makes it
pretty useless.

Why not give us an example where you get this message?

>simplify(sqrt((1-2*m(u)/R(u))*R(u)^4));
Error, (in simplify) invalid input: `simplify/sqrt/product` uses a 2nd
argument, n, which is missing

In the sequence of calculations I an doing, stuff like this can occor
all the time.

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In article <omk215$7rm$[email protected]>, William Unruh
<[email protected]> wrote:

On 2017-08-11, G. A. Edgar <[email protected]d> wrote:

Why not give us an example where you get this message?

>simplify(sqrt((1-2*m(u)/R(u))*R(u)^4));
Error, (in simplify) invalid input: `simplify/sqrt/product` uses a 2nd
argument, n, which is missing

In the sequence of calculations I an doing, stuff like this can occor
all the time.

In Maple 2015 I get...

simplify(sqrt((1-2*m(u)/R(u))*R(u)^4));

(-(-R(u)+2*m(u))*R(u)^3)^(1/2)

version();

User Interface: 1097895
Kernel: 1097895
Library: 1097895
1097895

Let's see what happens in other versions.

--
G. A. Edgar http://www.math.ohio-state.edu/~edgar/

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On 2017-08-15, G. A. Edgar <[email protected]d> wrote:

In article <omk215$7rm$[email protected]>, William Unruh
<[email protected]> wrote:

On 2017-08-11, G. A. Edgar <[email protected]d> wrote:

Why not give us an example where you get this message?

>simplify(sqrt((1-2*m(u)/R(u))*R(u)^4));
Error, (in simplify) invalid input: `simplify/sqrt/product` uses a 2nd >> argument, n, which is missing

In the sequence of calculations I an doing, stuff like this can occor
all the time.

In Maple 2015 I get...

simplify(sqrt((1-2*m(u)/R(u))*R(u)^4));

(-(-R(u)+2*m(u))*R(u)^3)^(1/2)

So, it looks like it is bug introduced into 2016.2 (maybe earlier).

version();

User Interface: 1097895
Kernel: 1097895
Library: 1097895
1097895

Let's see what happens in other versions.

I get
version();
User Interface: 1194701
Kernel: 1194701
Library: 1194701



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On Wednesday, August 16, 2017 at 2:47:09 AM UTC+12, William Unruh wrote:

On 2017-08-15, G. A. Edgar <[email protected]d> wrote:

In article <omk215$7rm$[email protected]>, William Unruh
<[email protected]> wrote:

On 2017-08-11, G. A. Edgar <[email protected]d> wrote:

Why not give us an example where you get this message?

>simplify(sqrt((1-2*m(u)/R(u))*R(u)^4));
Error, (in simplify) invalid input: `simplify/sqrt/product` uses a 2nd >> argument, n, which is missing

In the sequence of calculations I an doing, stuff like this can occor
all the time.

In Maple 2015 I get...

simplify(sqrt((1-2*m(u)/R(u))*R(u)^4));

(-(-R(u)+2*m(u))*R(u)^3)^(1/2)

So, it looks like it is bug introduced into 2016.2 (maybe earlier).

version();

User Interface: 1097895
Kernel: 1097895
Library: 1097895
1097895

Let's see what happens in other versions.

I get
version();
User Interface: 1194701
Kernel: 1194701
Library: 1194701

I get
|\^/| Maple 2017 (X86 64 LINUX)
._|\| |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2017
\ MAPLE / All rights reserved. Maple is a trademark of
<____ ____> Waterloo Maple Inc.
| Type ? for help.

simplify(sqrt((1-2*m(u)/R(u))*R(u)^4));

3 1/2
(-(-R(u) + 2 m(u)) R(u) )

version();

User Interface: 1231047
Kernel: 1231047
Library: 1231047
1231047

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It turned out that the problem was GRTensorII which I am almost always
running when I use Maple. Somehow it messed up the sqrt routine so that simplify got confused.

One needs to use
kernelopts(unread = `sqrt`):
in setting up grtensor.
(This only seems to be a problem with versions of maple at least later
than 9.5)

Sorry about the noise.


On 2017-08-15, William Unruh <[email protected]> wrote:

On 2017-08-15, G. A. Edgar <[email protected]d> wrote:

In article <omk215$7rm$[email protected]>, William Unruh
<[email protected]> wrote:

On 2017-08-11, G. A. Edgar <[email protected]d> wrote:

Why not give us an example where you get this message?

>simplify(sqrt((1-2*m(u)/R(u))*R(u)^4));
Error, (in simplify) invalid input: `simplify/sqrt/product` uses a 2nd >>> argument, n, which is missing

In the sequence of calculations I an doing, stuff like this can occor
all the time.

In Maple 2015 I get...

simplify(sqrt((1-2*m(u)/R(u))*R(u)^4));

(-(-R(u)+2*m(u))*R(u)^3)^(1/2)

So, it looks like it is bug introduced into 2016.2 (maybe earlier).

version();

User Interface: 1097895
Kernel: 1097895
Library: 1097895
1097895

Let's see what happens in other versions.

I get
version();
User Interface: 1194701
Kernel: 1194701
Library: 1194701

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