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Walter wrote: ↑

Sat Nov 17, 2018 12:32 pm

Not all. 1/x inverts the matrix. Consistency, you're called HP.

No, it doesn’t
INVRT inverts a matrix, 1/x inverts each element.

Cheers, Werner

X^2 will square all the matrix elements, it will not square the matrix.
Only (all?) single-argument functions will work on all elements of the matrix.
Eg. MOD doesn't work, but SIN, IP, SIGN, XTOA etc. work.

Cheers, Werner

Logan wrote: ↑

Wed Nov 07, 2018 5:30 pm

Inverse A, then multiply it by B (A^-1 in y-register, B in X).

With B in Y and A in X, divide. This is both faster and more accurate than inverting A, then multiplying by B.

Cheers, Werner

Hi, this is my version of LINE. differences with yours: it doesn't round the inputs. PIXEL rounds the inputs anyway. speed-optimized inner loop, using "x" AGRAPH instead of PIXEL, so no need to test negative input. It is independent of the CRES/RRES setting (yours isn't, you perform a SQRT on a nega...

That is possible indeed.
See the 3rd post in this thread

Cheers, Werner

They are, at least for the full command name. The catalog shows an abbreviated name which causes some commands to seemingly be out of place, eg ASINH and ASGN, until you realize the latter is really ASSIGN. This, however, does not apply to AOFF and AON, that are not abbreviated and are in their righ...

??
Whatever makes you think that?
Both are listed in CATALOG-FCN.

Cheers, Werner

From the manual: F34 F35 AGRAPH behaviour C C The image is merged with the existing display (logical OR) -- default state C S The image overwrites all pixels in that portion of the display S C Duplicate 'on' pixels are turned 'off' S S All pixels are reversed (logical XOR) Cheers, Werner

LBL “PIXOFF” “x” SF 34 AGRAPH CF 34 END The “x” is the multiplication sign. To be foolproof, the program would have to save the state of flags 34 and 35, then set 34 and clear 35, do AGRAPH and restore flags 34 and 35 to their original settings. But by default they are both clear, so.. Cheers, Werner

Unfortunately, this is exactly how the HP42S behaves as well.
Cheers. Werner