closest number to a treshold and greater than it

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MEXICO
MEXICO 2013-7-8
for example
i have
r1=0.9 r2=1.1 r3=1.2
i want to to know the r' that is nearest of 1 but greater than it.

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回答（2 个）

Image Analyst
Image Analyst 2013-7-8
Is this homework? What have you tried? Have you tried subtracting 1 from the numbers and see which has the smallest difference greater than 0?
diff1 = r1-1;
diff2 = r2-1;
diff3 = r3-1;
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Image Analyst
Image Analyst 2013-7-8
r = [0.8, 21.1, 3.9]; % Sample data
differences = r-1
differences(differences<0) = inf % Set <1 = to infinity.
[minValue, indexAtMin] = min(differences(differences>1))

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MEXICO
MEXICO 2013-7-8
ok i didnt explain well. i have this vector that is changing every iteration
[r1 r2 r3]
this values are around 1, but im only interested in the nearest number to one but it have to be greAter than 1. the hole problem is like this
i have 3 equation that only are valid when the are greater than one and i have to choose the nearest to one.
the values of r1 only help me to know what f(r) i have to use, the f(r) that its r value is the nearest to 1 but greater than 1. i couldnt figure it out how to write it in matlab
any ideas guys?
r1 f(r1)=#$%%&( r1 f(r2)=#$%%&( r1 f(r3)=#$%%&(
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Jan
Jan 2013-7-8
编辑：Jan 2013-7-8
The last line is very cryptic. And please add all informations required to understand the question by editig the question, not by posting an answer. Thanks.

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