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Doubt in a product erro

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Nélio Dias
Nélio Dias 2021 年 4 月 2 日
Hi, I have wrinting a code e get a 1×0 empty double row vector error
So, what I wrote:
t1 = 0:0.01:300;
pmenor = 25*0.9;
pmaior = 25*(1.1);
idx1 = find(t1== pmenor);
idx2 = find(t1 == pmaior);
I got
idx2 =
1×0 empty double row vector
But, if I write:
idx2 = find(t1 == 27.5);
idx2 =
2751
So I dont understand the error since idx1 gives me the correct answer, because we know that 25*1.1 = 27.5.
Thanks for reading.

採用された回答

Sulaymon Eshkabilov
Sulaymon Eshkabilov 2021 年 4 月 2 日
編集済み: Sulaymon Eshkabilov 2021 年 4 月 2 日
Here is a small correction to obtain the correct answers in your exercise:
t1 = 0:0.01:300;
N = 2; % Number of decimal digits to be rounded, e.g.: N = 2 or 3 or 5, etc.
pmenor = round(25*0.9, N);
pmaior = round(25*(1.1), N);
idx1 = find(t1== pmenor);
idx2 = find(t1 == pmaior);
  2 件のコメント
Nélio Dias
Nélio Dias 2021 年 4 月 4 日
Thanks for the help.
Sulaymon Eshkabilov
Sulaymon Eshkabilov 2021 年 4 月 4 日
You are welcome - it is a pleasure.

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その他の回答 (1 件)

the cyclist
the cyclist 2021 年 4 月 2 日
The reason has to do with the accuracy of floating-point math on a binary computer. I suggest you read this question and answer, to get a better understanding of what is going on.
  1 件のコメント
Nélio Dias
Nélio Dias 2021 年 4 月 4 日
Thanks for the sugestion

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