How to cut digits after the decimal point?

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Mark Golberg
Mark Golberg 2017-3-1
评论： Dyuman Joshi 2024-1-28
Hello, I have the following variable:
a1 = 0.1234
I want to cut all digits after the first one after the decimal point. Meaning:
a2 = 0.1
I've created the following code (q=1 in our example):
b1 = a1 .* 10^q;
b2 = floor(b1);
a2 = b2 ./ (10^q);
But, it output
a2 = 0.1000
How can I get rid of the zeros in the end?
Thank you.

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采纳的回答

John D'Errico
John D'Errico 2017-3-1
编辑：John D'Errico 2017-3-1
You can use
a2 = round(a1,1);
to round to that decimal point.
However, to display the number with no zeros, you may want to change your display format.
format short
a2
a2 =
0.1000
format short g
a2
a2 =
0.1
See the difference between short, and short g.
I tend to leave the display format as short g always, except for the rare time when I want to see more digits, then I move to long g.
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ΦΨ
ΦΨ 2024-1-28
编辑：ΦΨ 2024-1-28
Is there an option to cut not round? Meaning:
1.59 -> 1.5
Dyuman Joshi
Dyuman Joshi 2024-1-28
Ran in:
@ΦΨ
format shortg
%input
in = 1.59;
%digits to cut
n = 1;
%output
out = floor(in*10^n)/10^n
out =
1.5

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更多回答（1 个）

Adam
Adam 2017-3-1
编辑：Adam 2017-3-1
a2 = round( a1, 1 );
if you have a sufficiently recent version of Matlab. I can't remember when this functionality was added to the round function though.

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