Re: POW Function

[Cannon Smith via 4D_Tech]

Hi Andrew,

Thanks for the answer. Also, thanks to Miyako and Jeremy. Spencer actually 
helped me get this figured out offline, but I didn’t realize we’d gone offline. 
So its all taken care of.

Thanks.

--
Cannon.Smith
Synergy Farm Solutions Inc.
Hill Spring, AB Canada
403-626-3236




> On Jul 24, 2018, at 8:17 PM, Andrew Hickey via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> 
> As Spencer mentioned you need to transform the log from a natural log to
> base 10.

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Re: POW Function

[Keisuke Miyako via 4D_Tech]

I won't recommend it, but just to illustrate the difference:

$rRange:=1200-50
C_LONGINT($rExponent)
Begin SQL
SELECT LOG10(:$rRange) FROM _USER_SCHEMAS LIMIT 1 INTO :$rExponent
End SQL
$rMagnitude:=10^$rExponent


> But I’m getting an exponent of 7 instead of 3. Any ideas what I’m doing wrong?





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Re: POW Function

[Jeremy Roussak via 4D_Tech]

> On 24 Jul 2018, at 17:32, Cannon Smith via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> 
> 
> In 4D I’m doing this:
> 
> $rRange:=1200-50
> $rExponent:=Int(Log($rRange))
> $rMagnitude:=10^$rExponent
> 
> But I’m getting an exponent of 7 instead of 3. Any ideas what I’m doing wrong?
> 
> Thanks.


You’re using log base e. It’s not clear from the docs that 4D has a log base 10 
function. You might have to divide by 10 in a loop.

Jeremy
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Re: POW Function

[Spencer Hinsdale via 4D_Tech]

difference btwn log and natural log.  try LOG10

> On Jul 24, 2018, at 9:32 AM, Cannon Smith via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> 
> 
> But I’m getting an exponent of 7 instead of 3. Any ideas what I’m doing wrong?
> 

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Re: POW Function

[Cannon Smith via 4D_Tech]

Hi Spencer,

Yes, it is! So simple. Thank you.

Perhaps some more help from someone? I’m trying to translate some code on the 
web into 4D. Here are the lines of code along with an explanation:

range = max - min;  
exponent = int(log(range)); 
magnitude = pow(10, exponent);
//So, for example, if your range is from 50 - 1200, the exponent is 3 and the 
magnitude is 1000.


In 4D I’m doing this:

$rRange:=1200-50
$rExponent:=Int(Log($rRange))
$rMagnitude:=10^$rExponent

But I’m getting an exponent of 7 instead of 3. Any ideas what I’m doing wrong?

Thanks.

--
Cannon.Smith
Synergy Farm Solutions Inc.
Hill Spring, AB Canada
403-626-3236




> On Jul 24, 2018, at 10:19 AM, Spencer Hinsdale via 4D_Tech 
> <4d_tech@lists.4d.com> wrote:
> 
> is it caret?
> 
> 7^3
> 

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Re: POW Function

[Spencer Hinsdale via 4D_Tech]

is it caret?

7^3



> On Jul 24, 2018, at 9:15 AM, Cannon Smith via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> 
> I’m looking for an equivalent function in 4D as the pow function in other 
> languages. For example:
> 
>   
> <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/pow>
> 

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POW Function

[Cannon Smith via 4D_Tech]

I’m looking for an equivalent function in 4D as the pow function in other 
languages. For example:


<https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/pow>

Does anyone know how to do this? My math is really rusty.

Thanks.

--
Cannon.Smith
Synergy Farm Solutions Inc.
Hill Spring, AB Canada
403-626-3236




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