Re: slots with 2 indexed array?

*To*: mathgroup at smc.vnet.net*Subject*: [mg95599] Re: slots with 2 indexed array?*From*: dh <dh at metrohm.com>*Date*: Thu, 22 Jan 2009 07:02:31 -0500 (EST)*References*: <gl720c$c7u$1@smc.vnet.net>

Hi, mathematica is clever enough to figure which slot belongs to which function: If[# >= 2, # - 2, # + 2] & /@ # & /@ sig hope this helps, Daniel wb at wavebounce.com wrote: > First I produce some dummy data, 4000 of what I call signals, 1024 samples each. > > sigs = Table[10 i + j, {i, 4000}, {j, 1024}]; > len = Length[sigs]; > > I'd like to modify these signals. The For statement below works. I can use a slot function on each of the sigs specified by i. > > For[i = 1, i < len + 1, i++, > sigs[[i]] = If[# >= 2048, # - 2048, # + 2048] & /@ sigs[[i]] ] > > Surely there's a way to use slots on a double indexed array but I haven't found it yet. > > If I try to let # represent every entry in sigs, the If statement isn't processed: > > sigs = If[# >= 2048, # - 2048, # + 2048] & /@ sigs; > > I tried Which that Help says uses HoldAll but that doesn't work either; Which[] still isn't evaluated. > > I tried using #2 and ## instead of # but that doesn't work. In reading about slot functions I haven't seen any examples using multi indexed arrays. > > Could someone please give me a hint on how to pull this off? -- if this can be done with slots. Thanks. >