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

Question

Maria 2022-9-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1806180-how-can-i-use-round-function-to-change-decimal-value-to-integer

评论： Maria 2022-9-15

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

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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Answer 1

Walter Roberson 2022-9-15

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1806180-how-can-i-use-round-function-to-change-decimal-value-to-integer#answer_1054410

在 MATLAB Online 中打开

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