How can i use round function to change decimal value to integer ?

2022 9 15
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更新时间：2022 9 15
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Hi all!
i used the function "round" in order to round values in matrix, but it does not display the required result.
for example i have
x=1.5919 1.0e+06 *
i used
A=round(x)/(10^6)
i get this
X=1.5919 ,but the result i want is X=2.
Thanks in advance

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Walter Roberson
Walter Roberson 2022-9-15
Ran in:

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Ran in:
format long g
x = 1.5919 * 1.0e+06
x =
1591900
round(x/10^6)
ans =
2
If you are wanting to round to 1 significant digit, then it gets a bit more complicated in vectorized form
x = [pi*10^6, exp(1)*10^-5, -sqrt(2)*10^2, -inf, inf, 0, nan].'
x = 7×1
1.0e+00 * 3141592.65358979 2.71828182845904e-05 -141.42135623731 -Inf Inf 0 NaN
scale = 10.^floor(log10(abs(x)));
scale(scale == 0 | ~isfinite(scale)) = 1;
A = round(x ./ scale) .* scale
A = 7×1
1.0e+00 * 3000000 3e-05 -100 -Inf Inf 0 NaN

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