NSArray subsets and sorting from a dynamic categoryArray

i've run big question of approach in order fuel graph view.

retrieve arrays via coredata.

category <--->>entry entity relationship exists.

code:

category <-------->>entry  

i need combine results of category <-->> entry relationship array sorted nsdate, thats pretty easy, parent have multiple entries based on timestamp (nsdate) of adding it.

use fetchrequest following:

code:

    nssortdescriptor *sortdescriptor = [[nssortdescriptor alloc] initwithkey:@"timestamp" ascending:no];      nsarray *sortdescriptors = [[nsarray alloc] initwithobjects:sortdescriptor, nil];    

want have combined result thats sorted based on timestamps

example,

code:

    nsarray result_cata = [entries sortedby timestamp]; {a0 ,a1, a2, a3,     a5}   (5)      nsarray result_cattb = [entries sortedby timestamp]; {b0, b1, b2, b3, b4}       (5)      nsarray result_catc = [entries sortedby timestamp]; {c0, c1, c2, c3, c4  c5 }  (6)

two points note here,
1- array result_cata has no entryobject on date "4th" , likewise, b array has no entry on "5th", lets assume digits nsdates of adding.

want have array gives me result array like:

code:

    combinedsortedarray objectatindex:0] = array{a0, b0, c0}  countremains 3       combinedsortedarray objectatindex:1] = array{a1, b1, c1}  count remains 3      combinedsortedarray objectatindex:4] = array{0.0, b4, c4}      combinedsortedarray objectatindex:5] = array{a5, 0.0, c5}      //count of subset arrays remains 3  equal count of parents! difference being nil result replaced 0.0!  

2- more complicated knowing category dynamic number, there total number of 4 categories presented, in case there 4 arrays parse one, , each object of single sorted array have 4 object count.

im clueless now, appreciated.

 

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