Re: Calculator problem

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Re: Calculator problem

John Ferman-2
I have had the HP48GX calculator app for seemingly forever. It does much more than just calculate. You can create equations that can be saved and later be solved. You can assign units to numbers and then convert them, like feet to millimeters. The HP48 is just one of several programmable calculators available. If you need to solve things that are awkward, such as the optics and depth of field equations, you can write them and the HP48 will solve easily. I don't know if it is still free from Apple apps.

Sent from iPad
John Ferman
Minneapolis, MN

My doctor says I have a malformed public-duty gland and as a result have a severe morale fibre deficiency, so I should not be expected to save the world."


> On Mar 15, 2018, at 11:00 AM, [hidden email] wrote:
>
> Message: 10
> Date: Wed, 14 Mar 2018 17:52:18 -0400
> From: Jerome King <[hidden email]>
> To: Undisclosed recipients: ;
> Subject: Calculator problem on iPhones, iPads & Macs
> Message-ID: <[hidden email]>
> Content-Type: text/plain; charset="utf-8"
>
> Yesterday I passed on an alert that the Calculator application was not accurate and don’t depend upon it
> One member forwarded the message to a family member who under took to tell her that Siri didn’t have an issue



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Re: Calculator problem

Jerome King-2
I have an HP 12c physical calculator from the 1970 era. Wonder if it has value.

Until today I had NEVER pressed the % key and when I did today I don’t understand what is presented
        At any rate I confessed yesterday that I thought the % key was a display conversion  from decimal to %. It isn’t that, for sure, but on my Old HP I don’t know what it is supposed to do.
       
I will respond to some messages but it seems I started down a rabbit hole based upon no knowledge.

BUT the original notification that I forwarded was not about %. Thus go back to the original and see if your use of the Calculator application has risks

Jerry

> On Mar 15, 2018, at 2:15 PM, John Ferman <[hidden email]> wrote:
>
> I have had the HP48GX calculator app for seemingly forever. It does much more than just calculate. You can create equations that can be saved and later be solved. You can assign units to numbers and then convert them, like feet to millimeters. The HP48 is just one of several programmable calculators available. If you need to solve things that are awkward, such as the optics and depth of field equations, you can write them and the HP48 will solve easily. I don't know if it is still free from Apple apps.
>
> Sent from iPad
> John Ferman
> Minneapolis, MN
>
> My doctor says I have a malformed public-duty gland and as a result have a severe morale fibre deficiency, so I should not be expected to save the world."
>
>
>> On Mar 15, 2018, at 11:00 AM, [hidden email] wrote:
>>
>> Message: 10
>> Date: Wed, 14 Mar 2018 17:52:18 -0400
>> From: Jerome King <[hidden email]>
>> To: Undisclosed recipients: ;
>> Subject: Calculator problem on iPhones, iPads & Macs
>> Message-ID: <[hidden email]>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Yesterday I passed on an alert that the Calculator application was not accurate and don’t depend upon it
>> One member forwarded the message to a family member who under took to tell her that Siri didn’t have an issue
>
>
>
> ____________TidBITS Talk Participation Guidelines____________
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Re: Calculator problem

Bill Rausch
> I have an HP 12c physical calculator from the 1970 era. Wonder if it has
> value.
>
> Until today I had NEVER pressed the % key and when I did today I don’t
> understand what is presented
> At any rate I confessed yesterday that I thought the % key was a display
> conversion  from decimal to %. It isn’t that, for sure, but on my Old
> HP I don’t know what it is supposed to do.

Is the 12c an RPN calculator?  I wonder if it works like this:

Suppose you want 25% of 1.99.  1.99 -> Enter -> 25 -> %

BIll


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Re: Calculator problem

Jerome King-2
Yes it is a RPN

Did your sequence and to 0.50

My error was thinking % was a conversion from decimal to %   But it apparently is to tag a number as being a %, not the decimal

Sorry for having stirred up the discussion group

BUT apparently there is an issue with calculator in macOS / iOS. Not the % I mistakenly promoted

Jerry Naples

> On Mar 15, 2018, at 4:54 PM, Bill Rausch <[hidden email]> wrote:
>
>> I have an HP 12c physical calculator from the 1970 era. Wonder if it has
>> value.
>>
>> Until today I had NEVER pressed the % key and when I did today I don’t
>> understand what is presented
>> At any rate I confessed yesterday that I thought the % key was a display
>> conversion  from decimal to %. It isn’t that, for sure, but on my Old
>> HP I don’t know what it is supposed to do.
>
> Is the 12c an RPN calculator?  I wonder if it works like this:
>
> Suppose you want 25% of 1.99.  1.99 -> Enter -> 25 -> %
>
> BIll
>
>
> ____________TidBITS Talk Participation Guidelines____________
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Re: Calculator problem

Alan Forkosh
There was a bug in iOS 11.0 and 11.1 that inaccurately recorded your entries in if you typed fast, but it was fixed in iOS 11.2.

Alan Forkosh                    Oakland, CA
[hidden email]
http://al4kosh.com



On Mar 15, 2018, at 2:06 PM, Jerome King <[hidden email]> wrote:



BUT apparently there is an issue with calculator in macOS / iOS. Not the % I mistakenly promoted
….,




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Re: Calculator problem

David Ross
In reply to this post by Jerome King-2
RPN rules. The problem is that explanations such as yours make it look
complicated as you're having to explain it to an alternate reality. It
really isn't if you understand that it allows you to solve problems as
you think through them. But then again this might be the engineer in me
coming out.

I do know that while doing electrical engineering in the 70s the RPN
crowd (mine) were always faster than those using the "normal" TI
calculators. We also claimed to get the right answer more often but hard
data on that was thin on the ground. :)

On 3/15/18 8:26 PM, gastropod wrote:

> With HP RPN, the % key needs a number already on the stack--it's a two
> number operation, not a simple divide one number by 100 operator. The
> result is n% of the number in the x-register. The algorithm could be
> 'n divided by 100 multiplied by x', though they could be doing
> something more complicated that collapses to a simple thing for a
> simple problem.
> Clear the stack, press 5 or other number, press %. It shows zero and the whole stack is still empty.  n% x 0 = 0.
>
> Clear the stack, 500 <enter>, 10,  %, shows 50  (10% of 500), and 500 is left on the stack  ready to be used again if you need it.
>
> If you do this in pCalc in RPN mode, you can watch the stack.
>
> The more complex behind the scenes algorithm means that you could use % for much more complex problems than the simple divide by 100 thing, but I've still never found it useful.  Maybe for people who do a lot of financial stuff?
>
>



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Re: Calculator problem

Bill Rausch
> RPN rules. The problem is that explanations such as yours make it look
> complicated ...
> I do know that while doing electrical engineering in the 70s the RPN
> crowd (mine) were always faster than those using the "normal" TI
> calculators. ...

RPN calculators use fewer keystrokes because you don't need to enter the
parentheses. But, you do need to keep track of a little more in your head.

But I agree, RPN rules.


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