Working fine here
Xtian.
D←{24 ⎕cr ⍵}
D ⍳4
┌4──┐
│1 2 3 4│
└───┘
t←(3 4 ⍴ 12?100) (4 5 ⍴⍳20)
D t
┌2──┐
│┌4───┐ ┌5─┐│
│377 85 51 69│ 4 1 2 3 4 5││
││ 8 42 46 41│ │ 6 7 8 9 10││
││93 67 100 52│ │11 12 13 14 1
Hi Alexey,
it works on my machine:
DISPLAY←{8⎕CR ⍵}
⎕CR 'DISPLAY'
λ←DISPLAY ⍵
λ←8⎕CR ⍵
DISPLAY 1 2 3
┌→┐
│1 2 3│
└─┘
Yo
Hi,
I want to make an alias for the display function, like in Dyalog APL
DISPLAY, but by some reason can't.
I want to function DISPLAY behave as 8⎕CR:
DISPLAY←{8⎕CR ⍵}
produces an error:
DEFN ERROR
λ1
^
The
DISPLAY←8⎕CR
also doesn't work:
SYNTAX ERROR
DISPLAY←8 ⎕CR
Hi Mike,
I see. I have increased the number of digits to 17, but
only for ⎕TF (because
otherwise a few of my automated testcases would break). SVN
674.
/// Jürgen
On 09/04/2015 05:42 PM, Mike Duvos
wrote:
One small correction. 2^53 is 9e15, which is 16 digits, so writing stuff
rounded to 17 decimal places should exactly reproduce it for IEEE 64 bit
floats. I don't know why 18 popped into my head.
*So just let the maximum *
*⎕PP be 17 instead of 16, and all will be well.*
On Fri, Sep 4, 2015
I see the problem. You limit *⎕PP to 16, which isn't enough digits. 1E**¯16
is 1 to 16 places.* I didn't notice this, because you just set it to 16 if
I set it to 18.
You need to allow a larger
*⎕PP to exactly reproduce floating data written out and read back in.*
Hi Jürgen,
To reproduce a floating point value exactly when it is read back in after
being converted to ASCII, it is necessary to write out one past the maximum
number of decimal digits the floating point representation supports.
64 bit IEEE is 17 decimal places, so you have to write out 18.
So
Hi Mike,
I can't really see what's wrong here. On my platform I get:
ALMOST_ONE←1D45*8
2 ⎕TF 'ALMOST_ONE'
ALMOST_ONE←9.998E¯1J¯2.449293598294707E¯16
2 ⎕TF is independent of ⎕PP and ⎕CT and it
prints floating
