(Free42) matrix copy/paste bug

[Werner]

Strange, because that's what I did.. in Firefox.
Anyway - found another anomaly ;-)
If I try and create a Nx2 matrix with a "J" in the (1,1) position, I get a complex matrix? So I change the "J" into something else and then it works.
Can't guarantee the tabs will show up here:

Code:

J    1
erg    1ᴇ-7
Kcal    4186.8
cal    4.1868
Btu    1055.05585262
ft×lbf    1.35581794833
therm    105506ᴇ3
MeV    160219ᴇ-18
eV    160219ᴇ-24

Cheers, Werner

[Thomas Okken]

"J" / "j" is accepted as an alternative spelling of "I" / "i", so your Joule unit turns into (0, 1).

Hmmm, maybe I should make it accept only lowercase i and j as the imaginary unit. Does anyone actually use uppercase I or J for this? I don't remember why I coded it that way...

[Werner]

Yes, that’s what I figured - but the 42 does not know i or I or j, it’s always a string?
Werner

[Thomas Okken]

I don't understand the question. Are you saying there is an inconsistency? If so, where?

[Werner]

I was wrong - it does know i of course, but not a lone i, and not a j or J.
It’s not a big deal, you know..
Werner

[Thomas Okken]

(02-09-2018 05:49 PM)Werner Wrote:  I was wrong - it does know i of course, but not a lone i, and not a j or J.
It’s not a big deal, you know..
Werner

Do you mean how it displays and copies numbers, vs. the formats it accepts when pasting?
I'm having trouble making sense of your first sentence.

[Werner]

You cannot enter i in the 42. It displays it in complex numbers, that is all.
i is shown as ‘0 i1’ - that’s what I mean with it not being a lone i.
I have no idea what formats the copy/paste accepts for complex numbers? Apparently it interprets J,j,I,i as 0 i1.
One way to solve this is to allow defining strings between double quotes. Then I can put “J” for a string and J for a complex number.
Cheers, Werner

[Thomas Okken]

Paste recognizes complex numbers is these formats:

NUMBER ANGLE_SYMBOL NUMBER
NUMBER SIGN UNSIGNED_NUMBER IMAGINARY_UNIT
NUMBER SIGN IMAGINARY_UNIT
( NUMBER , NUMBER )

Where ANGLE_SYMBOL is ∠ or ∡ (U+2220 "angle" or U+2221 "measured angle")
SIGN is + or -
IMAGINARY_UNIT is I, i, J, or j
Also, in the vector notation, : or ; may be used instead of comma. If comma is used, it must be separated from the numbers preceding and following it by spaces.

[Werner]

Thanks, Thomas.
Why
NUMBER SIGN UNSIGNED_NUMBER IMAGINARY_UNIT
And not
NUMBER NUMBER IMAGINARY_UNIT


moreover, it seems IMAGINARY_UNIT must always be preceded by a number, so why does a lone J get interpreted as a complex number?

Cheers, Werner

[Thomas Okken]

(02-10-2018 06:15 AM)Werner Wrote:  Why
NUMBER SIGN UNSIGNED_NUMBER IMAGINARY_UNIT
And not
NUMBER NUMBER IMAGINARY_UNIT

Because the latter would allow, say, "2 3i". I think there should always be a + or a - between the real and imaginary parts in this kind of notation.

(02-10-2018 06:15 AM)Werner Wrote:  moreover, it seems IMAGINARY_UNIT must always be preceded by a number, so why does a lone J get interpreted as a complex number?

I goofed and missed that case in my list of accepted formats. The code does, in fact, handle this.
The imaginary unit does not have to be preceded by a number; 1+i and 1-i are valid, and so are i and -i.

[Werner]

Thanks for the detailed explanation!
Werner

[Thomas Okken]

In 2.0.14, I and J are no longer recognized as the imaginary unit; only i and j are.
Regarding the use of quote signs to force a cell to be interpreted as a string: I hope the 2.0.14 change makes that issue mostly moot.

[Werner]

Well, yes and no ;-) The day I need to copy a string "i" or "j", I'll be back ;-)
Thanks, Thomas !

Werner