How can I cut four numbers after the decimal number without rounding using MATLAB ?

Question

Muhammad Salem 2023-12-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2055694-how-can-i-cut-four-numbers-after-the-decimal-number-without-rounding-using-matlab

评论： Walter Roberson 2023-12-4

采纳的回答： John D'Errico

I have a number like this:

2.32166873546944

I want to take only four numbers after the decimal point and without rounding, that is, I only want:

2.3216

How do I do this in Matlab ?

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Answer 1

John D'Errico 2023-12-3

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2055694-how-can-i-cut-four-numbers-after-the-decimal-number-without-rounding-using-matlab#answer_1364749

编辑：John D'Errico 2023-12-3

在 MATLAB Online 中打开

You want to truncate after the 4th decimal place? Easy peasy.

You shift where the decimal place lies, then use floor.

format long g
x = 2.32166873546944
x = 
          2.32166873546944
y = floor(x*10000)/10000
y = 
                    2.3216

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Muhammad Salem 2023-12-4

Thank you so much.

Walter Roberson 2023-12-4

在 MATLAB Online 中打开

If you want "four digits after the decimal place" you should probably use fix() instead of floor()

format long g
x = 2.32166873546944
x = 
          2.32166873546944
xn = -x
xn = 
         -2.32166873546944
y1 = floor(x*10000)/10000
y1 = 
                    2.3216
y2 = fix(x*100000)/100000
y2 = 
                   2.32166
y3 = floor(xn*10000)/10000
y3 = 
                   -2.3217
y4 = fix(xn*10000)/10000
y4 = 
                   -2.3216