what is the meaning of these random numbers

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Ayesha Punjabi
Ayesha Punjabi 2019-3-11
回答： Walter Roberson 2021-8-15
  • does anyone know the meaning of this ?
  • >> r = (randi(0:1, 5, 16)+'0')
  • tag_arr =
  • 49 48 48 49 48 48 49 48 48 49 49 48 48 49 49 49
  • 49 49 49 48 49 48 48 49 48 49 49 48 48 49 49 49
  • 48 49 49 48 49 49 48 48 49 48 49 48 49 48 48 48
  • 49 48 49 49 49 48 48 48 48 49 48 48 48 48 49 48
  • 48 49 49 48 48 49 48 49 49 48 49 48 49 48 49 49
  • I am trying to understant why is it giving me only 48 and 49 values?? what is the meaning of this output.?

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回答（2 个）

Star Strider
Star Strider 2019-3-11
it is giving you a (5 x 16) matrix of ASCII values for '0' and '1'.
Walter Roberson
Walter Roberson 2021-8-15
Ran in:
The character code for the character '0' is 48. You are generating random numbers that are either 0 or 1, and you are adding 48, so you are getting 48 or 49. You could have done,
targ_arr = char(randi(0:1, 5, 16)+'0')
targ_arr = 5×16 char array
'0111111100101111' '1001111011011101' '1111010110111000' '0100010110011011' '0000010011001101'
to see the character equivalents.
https://en.wikipedia.org/wiki/Basic_Latin_(Unicode_block) U+0030 is '0' . U+ numbers are in hex, so
hex2dec('0030')
ans = 48

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