i keep getiing ' variable Remainder appears to change size on every loop itearation. Consider prelocating for speed

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THABANG MONOANE
THABANG MONOANE 2020-6-2
回答： Sai Sri Pathuri 2020-7-9
Letters = {'A' 'B' 'C' 'D' 'E' 'F' 'G' 'H' 'I' 'J' 'K' 'L' 'M' 'N' 'O' 'P' 'Q' 'R' 'S' 'T' 'U' 'W' 'X' 'Y' 'Z'};
ValueString = num2str(ValueToConvert);
Remainders = [];
while ValueToConvert < 0
Value = 0;
while ValueToConvert >= Base
Value = Value + 1;
ValueToConvert = ValueToConvert - base;
end
Remainders = [Remainders ValueToConvert];
ValueToConvert = Value;
clear Value Remainders
end

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回答（1 个）

Sai Sri Pathuri
Sai Sri Pathuri 2020-7-9
This is a warning to indicate that the variable 'Remainders' is not of fixed size and changes its size in every iteration of the loop. This message generally appears because an array is growing by assignment or concatenation, which can be expensive and cause a significant overhead .
Suggested Actions
  1. Consider preallocating a variable or array before entering the loop by using zeros, ones, cell, or a similar function.
  2. If you do not know the size of an array before the loop begins, preallocate it with some large size, and then if necessary, shrink it after the loop completes.
You may also refer the following answers
https://in.mathworks.com/matlabcentral/answers/122239-the-variable-appears-to-change-size-on-every-loop-iteration#answer_129135
https://in.mathworks.com/matlabcentral/answers/273445-error-when-debugging-problem?s_tid=answers_rc1-1_p1_BOTH

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