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Question about Casio fx-115MS

J

Jack Crane

Jan 1, 1970
0
What does the Rnd key (SHIFT 0) (in the lower-left corner) on the Casio fx-
115MS calculator do, and how is it used?

And is there anywhere on the web a better manual than the one that comes
with the product? Or a tutorial?

Thanks,

Jack
 
J

Jonathan Kirwan

Jan 1, 1970
0
What does the Rnd key (SHIFT 0) (in the lower-left corner) on the Casio fx-
115MS calculator do, and how is it used?
<snip>

It produces a "random" number.

Jon
 
S

Steve Evans

Jan 1, 1970
0
What does the Rnd key (SHIFT 0) (in the lower-left corner) on the Casio fx-
115MS calculator do, and how is it used?

It rounds off the internal value contained in the Y-register so it
equals the displayed value.
 
J

Jack Crane

Jan 1, 1970
0
It rounds off the internal value contained in the Y-register so it
equals the displayed value.

Could you give me an example that includes the keys to push?

Thanks,

Jack
 
J

Jonathan Kirwan

Jan 1, 1970
0
From what range? The Rnd# key gives a random number in (0,1).

Yup! I was looking down at the calculator and looked for shift-0 and instead
saw shift-. My mistake. Actually, I don't recall ever using Rnd, which is
probably why I so quickly assumed I picked out the right key. Sorry about that.

Jon
 
J

Jack Crane

Jan 1, 1970
0
Yup! I was looking down at the calculator and looked for shift-0 and
instead saw shift-. My mistake. Actually, I don't recall ever using
Rnd, which is probably why I so quickly assumed I picked out the right
key. Sorry about that.

Jon
Apology accepted.

Jack
 
S

Steve Evans

Jan 1, 1970
0
Could you give me an example that includes the keys to push?

I guessso, but its rather late now where I am. I'll do it ifircall
tomorrow.
 
S

Steve Evans

Jan 1, 1970
0
I guessso, but its rather late now where I am. I'll do it ifircall
tomorrow

Well here I amagain. Your calculator has three main registers for
holding current values, X, Y, and K registers. they each have three
particular jobs to do. X is the working reg., holding the displayed
value, Y's like a variable reserve reg. for any ohter 'reserve' value
and K holds fixed, programmable values. If you divide 50 by 10 then
press <shift><x-y> you'll get the result 0.2 ratger tgan 5. Fool
around with these registers and the RND function and yo';ll see what
goes down. BTW, if you don't know what it does, why do you need to use
it?
Have fun.
 
R

Robert Monsen

Jan 1, 1970
0
Steve said:
Well here I amagain. Your calculator has three main registers for
holding current values, X, Y, and K registers. they each have three
particular jobs to do. X is the working reg., holding the displayed
value, Y's like a variable reserve reg. for any ohter 'reserve' value
and K holds fixed, programmable values. If you divide 50 by 10 then
press <shift><x-y> you'll get the result 0.2 ratger tgan 5. Fool
around with these registers and the RND function and yo';ll see what
goes down. BTW, if you don't know what it does, why do you need to use
it?
Have fun.

Try this sequence:

PI = sin ans

you get zero.

Now, try

PI rnd = sin ans

you get 3.59n (or 3.59e-9)

The rnd rounded PI to the digits on the display, so the answer wasn't
exact wrt the internal registers.

I can't think of a good use for this key. You almost never care about
more than a few significant digits anyway.

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.
 
J

Jack Crane

Jan 1, 1970
0
Well here I amagain. Your calculator has three main registers for
holding current values, X, Y, and K registers. they each have three
particular jobs to do. X is the working reg., holding the displayed
value, Y's like a variable reserve reg. for any ohter 'reserve' value
and K holds fixed, programmable values. If you divide 50 by 10 then
press <shift><x-y> you'll get the result 0.2 ratger tgan 5.

My fx-115MS has no said:
Fool
around with these registers and the RND function and yo';ll see what
goes down.

So why don't you just tell me what RND does?

BTW, if you don't know what it does, why do you need to use

Is that a joke? If not, what do you mean? If I knew what it does, I might
or might not find it useful. If it is useful to me, then I need it.

Jack
 
J

Jack Crane

Jan 1, 1970
0
Try this sequence:

PI = sin ans

you get zero.

OK, in RAD MODE I pushed SHIFT-PI, =, sin, ANS, and got 0. That's fine.
Now, try

PI rnd = sin ans

you get 3.59n (or 3.59e-9)

I pushed SHIFT-PI, SHIFT-Rnd, =, sin, ANS, and got 0 again, not your
3.59n. Do you have the fx-115MS?
The rnd rounded PI to the digits on the display, so the answer wasn't
exact wrt the internal registers.

I can't think of a good use for this key. You almost never care about
more than a few significant digits anyway.

Thanks for trying to help.

Jack
 
R

Robert Monsen

Jan 1, 1970
0
Jack said:
OK, in RAD MODE I pushed SHIFT-PI, =, sin, ANS, and got 0. That's fine.



I pushed SHIFT-PI, SHIFT-Rnd, =, sin, ANS, and got 0 again, not your
3.59n. Do you have the fx-115MS?




Thanks for trying to help.

Jack

Sorry, I got the directions wrong, you need to put the value PI into the
internal registers before you hit shift rnd. So, try this:

shift PI = (puts it into the register)
shift rnd (rounds register to whats on the display,
subtracting some delta)
sin ans = (computes sin(PI - delta))

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.
 
J

Jack Crane

Jan 1, 1970
0
Sorry, I got the directions wrong, you need to put the value PI into the
internal registers before you hit shift rnd. So, try this:

shift PI = (puts it into the register)
shift rnd (rounds register to whats on the display,
subtracting some delta)
sin ans = (computes sin(PI - delta))

Ok, got it. Thanks.

BTW how did you learn this? I've found online PDFs of both sheets that came
with my calculator, and that constitute its manual. They are at
<ftp.casio.co.jp/pub/world_manual/ edu/en/fx100MS_115MS_E.pdf>

And

<http://ftp.casio.co.jp/pub/world_manual/edu/en/fx115MS_991MS_E.pdf>

And Rnd is mentioned in neither of them.

I'm now trying to figure out CALC. Could you take a look at the PDF of the
second link I've quoted (or at your calculator's manual)? The CALC Memory
section is on page 6 of the PDF. The example there doesn't work correctly
for me. When I finish entering the function the screen shows "x-cubed + 3x
- 12", which looks good. Then I push CALC and answer "7" for the "x?"
prompt. I get 352 (instead of the correct 58). And for x=8 I get 524 (not
76). Any ideas?

Thanks,

Jack
 
S

Steve Evans

Jan 1, 1970
0
My fx-115MS has no <x-y>.

Really? Mine is obtained by pressing <shift><X^2> But I use the
fx-3400P which may differ in some respects. I assumed mine was just
hte programmable version of yours, but the differences might go wider,
I dunno.
So why don't you just tell me what RND does?

Robert and me have already told you that.
Is that a joke? If not, what do you mean? If I knew what it does, I might
or might not find it useful. If it is useful to me, then I need it.

Fair enough.
 
C

Chaos Master

Jan 1, 1970
0
Jack Crane is, and always will be:
So why don't you just tell me what RND does?

I think it stands for 'round number'.

I have not had a Casio calculator for a long time, but AIUI and IIRC it
works like:

3.5683927835
3

RND

3.568

(rounding 3.5683927835 to 3 decimal)

--
Chaos Master®, posting from somewhere near Porto Alegre, Brazil.
"... one either has a shit, or not. Do you have yours?"
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
http://marreka.blogspot.com --> news, hotter than high-power transistors!

To reply remove "DEADTOTHESPAMMER" from address.

NP in foobar2000: 15. Evanescence - [Fallen #05] Haunted [3:07]
 
R

Robert Monsen

Jan 1, 1970
0
Jack said:
@attbi_s01:




Ok, got it. Thanks.

BTW how did you learn this? I've found online PDFs of both sheets that came
with my calculator, and that constitute its manual. They are at
<ftp.casio.co.jp/pub/world_manual/ edu/en/fx100MS_115MS_E.pdf>

And

<http://ftp.casio.co.jp/pub/world_manual/edu/en/fx115MS_991MS_E.pdf>

And Rnd is mentioned in neither of them.

I'm now trying to figure out CALC. Could you take a look at the PDF of the
second link I've quoted (or at your calculator's manual)? The CALC Memory
section is on page 6 of the PDF. The example there doesn't work correctly
for me. When I finish entering the function the screen shows "x-cubed + 3x
- 12", which looks good. Then I push CALC and answer "7" for the "x?"
prompt. I get 352 (instead of the correct 58). And for x=8 I get 524 (not
76). Any ideas?

Thanks,

Jack

The answer is, actually 352:

7^3 = 343
3x7 = 21

so

343 + 21 - 12 = 352

Sounds like you are doing it right...

Now, try to figure out 'solve'.

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.
 
J

Jack Crane

Jan 1, 1970
0
The answer is, actually 352:

7^3 = 343
3x7 = 21

so

343 + 21 - 12 = 352

Sounds like you are doing it right...

Oops. Thanks for checking this. In dim light with dimming eyes, from the
manual I had read X-cubed instead of X-squared.
Now, try to figure out 'solve'.

OK! I'll try later today.

Jack
 
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