I continue to be surprised by the ability
of J on the iPhone to run rather substantial
programs. I have a J version of a program to
compute photoionization models of planetary
nebulae. It has a main section of 500 lines
or so and calls about 30 other verbs and data
sets. One of these (2D grids of the collisional
cooling by each of 16 ions) has dimensions of
55 250 16 4. The program integrates a system
of 28 differential equations.
Last night, expecting the worst, I loaded it
into my iPhone (on my jailbroken iPhone 4S, I
used the freeware "Fugu" to make transfers from
my MacBook Pro). And the thing runs! I do have
to make use the unofficial "Insomnia.app" to
keep the phone from going to sleep during the
computations, which can take 10's of minutes.
I'm just writing this to encourage others to
explore the limits of J on your phone - you
may be surprised.
Patrick
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