wolfram mathematica - For loop to change the values of a four dimensional table -


i on something,

i have table:

initialmatrix[x_, y_, age_, disease_] :=    replacepart[table[floor[divide[dogpopulation/cellsno,9]], {x}, {y}, {age}, {disease}],  {{_, _, 1, _} ->  0, {_, _, 3, _} -> 6}];

i trying set condition change values inside table sumthing else, according value, tried:

listinitial={};  for[a = 1, < 4, a++,   for[b = 1, b < 4, b++,    for[x = 1, x < 4, x = x + 1,     for[z = 1, z < 4, z = z + 1,   listinitial =   if[random[] > psurvival,         replacepart[ initialmatrix[3, 3, 3, 3], {a, b, x, z} ->          initialmatrix[3, 3, 3, 3][[a]][[b]][[x]][[z]] - 1],         initialmatrix[3, 3, 3, 3], {a, b, x, z} ->         initialmatrix[3, 3, 3, 3][[a]][[b]][[x]][[z]]]]]]]

but changes last part of table, decided use following code instead of loop,

setattributes[myfunction, listable]  myfunction[x_] :=   if[random[] > psurvival, if [x - 1 < 0 , x , x - 1], x]   myfunction[initialmatrix[3, 3, 3, 3]] // tableform

but want change specific parts inside table, example want part {__,__,3,_} change tried choose range mapat again think need loop, , cannot, can 1 please me?

for[x = 1, x < 4, x++,   listab[mapat[f, initialmatrix[3, 3, 3, 3], {x, 3, 3}]//tableform]]

if check out documentation mapat, see can address multiple elements @ various depths of tensor, using various settings of third argument. note use of flatten's second argument. think looking for.

mapat[g, initialmatrix[3, 3, 3, 3],  flatten[table[{i, j, 3, k}, {i, 3}, {j, 3}, {k, 3}], 2]]

http://reference.wolfram.com/mathematica/ref/mapat.html http://reference.wolfram.com/mathematica/ref/flatten.html

since seems second attempt ask question involving complicated loop, may emphasise almost never need or loop in mathematica in circumstances use 1 in, say, fortran or c. not construction of lists. table works. things listable functions (which know know) , commands nestlist, foldlist , array.

you find tutorial useful. http://reference.wolfram.com/mathematica/tutorial/selectingpartsofexpressionswithfunctions.html


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