Feature Request: Add Log10 (Logarithm Base 10) function to textfields

[GreenGirl]

I was recently shown: https://affinity.help/designer/English.lproj/pages/Workspace/expressions.html

However, the function I need (Log10) is missing.

Please add?

Also, is it possible to use multiple functions in a single text field? I have need to specify a number between a range of positive real numbers into a formula like this:

(360.0 * log10(sin(number that can vary between 0 and 1)))

[Alfred]

2 minutes ago, GreenGirl said:

Also, is it possible to use multiple functions in a single text field? I have need to specify a number between a range of positive real numbers into a formula like this:

 (360.0 * log10(sin(number that can vary between 0 and 1)))

Yes, you can do that (but obviously not with log10 at the moment).

[John Rostron]

To convert from natural logs to logs base 10, just multiply by 0.434294481903252 (log10(exp(1)).

You can easily include this constant in your expressions.

John

[walt.farrell]

5 hours ago, John Rostron said:

You can easily include this constant in your expressions.

Easily?

I don't think I've ever seen a 14 decimal-place constant called easy

[Old Bruce]

2 hours ago, walt.farrell said:

Easily?

I don't think I've ever seen a 14 decimal-place constant called easy

Well there is easy and then there is accurate... In my head pi used to have 6 decimal places, now it only has 2.

[John Rostron]

14 hours ago, walt.farrell said:

Easily?

I don't think I've ever seen a 14 decimal-place constant called easy

You can copy and paste a 14 decimal place constant just as easily as a 2 decimal place one.

John

[Alfred]

12 hours ago, Old Bruce said:

Well there is easy and then there is accurate... In my head pi used to have 6 decimal places, now it only has 2.

I’m shocked to discover that you don’t remember it to twenty decimal places (3.14159265358979323846) as I do! 

[John Rostron]

On 7/19/2019 at 12:52 PM, Alfred said:

I’m shocked to discover that you don’t remember it to twenty decimal places (3.14159265358979323846) as I do! 

I do recall there was a mnemonic for the decimal digits of pi that began "How I wish I could ..." I recall that Archimedes" featured somewhere for 9.

John

[Alfred]

1 hour ago, John Rostron said:

I do recall there was a mnemonic for the decimal digits of pi that began "How I wish I could ..." I recall that Archimedes" featured somewhere for 9.

That rings a vague bell, John. The mnemonic I know is

Quote

Sir, I bear a rhyme excelling,
In mystic force and magic spelling.
Celestial sprites elucidate,
All my own striving can’t relate.

One nice touch is that it even includes a comma for the decimal separator after ‘Sir’ (3). I find it almost as easy to remember a string of twenty digits, which has the advantage that you don’t need to do any counting, but it’s good to have a mnemonic to fall back on if you get lost somewhere along the way!

[Alfred]

5 hours ago, John Rostron said:

I recall that Archimedes" featured somewhere for 9.

I’ve just re-read this and spotted a slight problem: “Archimedes” has 10 letters!

Edit: Found it!

Quote

How I wish I could recollect, of circle round, the exact relation Arkimedes (or Archimede) learned

https://www.mnemonic-device.com/arithmetic/pi/may-i-have-a-large-container-of-coffee/

[John Rostron]

4 minutes ago, Alfred said:

I’ve just re-read this and spotted a slight problem: “Archimedes” has 10 letters!

I told you that it was what I recalled. I did not say my recollection was accurate. I met this mnemonic at school, probably over sixty years ago!

John

[John Rostron]

13 minutes ago, Alfred said:

16 minutes ago, Alfred said:

How I wish I could recollect, of circle round, the exact relation Arkimedes (or Archimede) learned

 

I think that a mnemonic that relies on a variant spelling is of less than optimal utility.

John

[Alfred]

7 minutes ago, John Rostron said:

I think that a mnemonic that relies on a variant spelling is of less than optimal utility.

As clearly demonstrated by the fact that you couldn’t recall it accurately a mere sixty years later.

[fde101]

If anyone is *that* bored and needs something to do, here are the first million digits of pi: https://www.piday.org/million/