What will be the output of of CD(1:8:8*16)=ciphertext

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Jayashree Walimbe
Jayashree Walimbe am 15 Jul. 2019
Kommentiert: Guillaume am 16 Jul. 2019
What is the result of CD(1:8:8*16)=ciphertext ? Not able to interpret this.
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Walter Roberson
Walter Roberson am 15 Jul. 2019
Imagine that CD is an array that is 8 x 16. Then that operation would be the same as storing values to the entire first row.

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Guillaume
Guillaume am 15 Jul. 2019
Bearbeitet: Guillaume am 16 Jul. 2019
It simply replaces elements 1,9,17, 25, ..., 121 of CD by the elements of ciphertext. Since that's 16 elements of CD that are replaced, if ciphertext does not have exactly 16 elements, the line is an error.
If CD is an 8x16 matrix, then as Walter commented, this replace the first row of CD. And in that case CD(1, :) = ciphertext would have been clearer.
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Walter Roberson
Walter Roberson am 15 Jul. 2019
It is 16 elements, Guillaume, not 15.
Guillaume
Guillaume am 16 Jul. 2019
@Walter. Indeed! I don't know what I was thinking. Fixed now.

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