Why is my array so big?
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David Pesetsky
am 16 Feb. 2015
Kommentiert: dpb
am 18 Feb. 2015
Hello,
I am trying to make a 1 dimensional vertical array of about 5500 strings. Even better, maybe convert the whole thing to a single string using Char()??
Anyway, I need to concatenate several "strings" together, and then store in one array location. But it seems it's not counting the concatenated string as one string, because I got the message the array was too large to be displayed, which shouldn't happen.
The code is too convoluted to post it all, but I believe the relevant pieces are below:
I initialize like this-
AoA = repmat({''}, 5589, 1);
I build up my string in a couple steps. I have a loop that tacks on pieces to this string-
AoAr = [AoAr ',' num2str(mean(AoA_sim(ind)))];
...so I hope that winds up being one long string. Then I tack that onto this-
AoA{k,1} = strcat(num2str(set_theta), ',', ...
num2str(Wr_r_grid(k)*S{NR+2,1}/v_r_grid(k)), ',', AoAr);
...where I again hope the strcat and num2str's force all that to really be just one string that takes up one cell.
Finally I do a-
AoAout=char(AoA);
...and when I try to view AoAout, it says "Cannot display summaries of variables with more than 524288 elements.". So I assume I'm not handling the data properly.
I think it's not smooshing down like I had hoped. I probably went wrong in several areas...can someone help me out?
I appreciate it in advance!
Dave
10 Kommentare
dpb
am 17 Feb. 2015
Bearbeitet: dpb
am 17 Feb. 2015
Well, there is, but you have to look at "the rest of the story"
>> c={s}
c =
'-4, 2.83, 89.65, 81.78'
>> whos c
Name Size Bytes Class Attributes
c 1x1 104 cell
>>
c is a one-cell cell array but it now takes 104 bytes to store the cell string of 22 characters (44 bytes) or 4 doubles (32 bytes). That's even more overhead for the luxury of the cell array.
Cell arrays and cell strings have their place (they're the only way to store "jagged" arrays, for example) but they and the other higher-level datatype abstractions come at a price. "There is no free lunch"
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David Pesetsky
am 18 Feb. 2015
1 Kommentar
dpb
am 18 Feb. 2015
"...to use the "more expensive" cell array, since I have strings mixed with numbers, ..."
That's another reason for cell arrays, yes...
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