Note that as Brian's post implies this is to do with the font you are using in your J session. Some fonts include more or less unicode chars. If you were wanting to use these chars in an application you would need to specify a font or fonts that you knew contained the desired unicode chars.
On Tue, Jan 24, 2012 at 11:08 AM, Raul Miller <rauldmil...@gmail.com> wrote: > In my copy of j, only u: 16b2588 (a solid block) and u: 16b258c (a > block occupying the left hand side of the character position) display > reasonably. > > The others are hollow boxes. > > -- > Raul > > On Mon, Jan 23, 2012 at 4:47 PM, Ian Clark <earthspo...@gmail.com> wrote: >> Unicode has a set of characters for building a crude (horizontal) histogram: >> >> u: 16b2588 NB. U+2588 (9608) 1.0 >> u: 16b2589 NB. U+2589 (9609) 0.875 >> u: 16b258a NB. U+258a (9610) 0.75 >> u: 16b258b NB. U+258b (9611) 0.625 >> u: 16b258c NB. U+258c (9612) 0.5 >> u: 16b258d NB. U+258d (9613) 0.375 >> u: 16b258e NB. U+258e (9614) 0.25 >> u: 16b258f NB. U+258f (9615) 0.125 >> >> They can be used to implement a progress bar, or embed little >> histograms in tables of figures. >> >> Notice a curious thing: these code points divide the basic block >> (U+2588) into *eights*, not tenths! Why? >> >> I imagine it's for ultra-efficient ASM to pick the part-block from the >> (base-2) mantissa of a floating-point number. But how do you do it >> ultra-efficiently in J? >> >> See my solution at: http://www.jsoftware.com/jwiki/Essays/Unicode%20Histogram >> This uses the verb: fh to pick the code-point for the final >> part-block. But I don't believe for a moment it's the best solution. >> Anyone got a quicker/slicker fh? >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
