Comparing my array to two variables

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Matlabhelp 2016-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/304995-comparing-my-array-to-two-variables

评论： Image Analyst 2020-8-25

Hello

I'm trying to compare my array values ( numerical ) to two variables. For example i would like any number in my array greater than 2 to be rounded to two, and any number less than 0 rounded to 0. I can't seem to find a simple expression to do this. So i would like to compare all numbers in the array to those two conditions and then round them to their respective closest number. How do i possible go about this?

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Image Analyst 2020-8-25

Original question in case he deletes is like he's done with other posts:

Hello

I'm trying to compare my array values ( numerical ) to two variables. For example i would like any number in my array greater than 2 to be rounded to two, and any number less than 0 rounded to 0. I can't seem to find a simple expression to do this. So i would like to compare all numbers in the array to those two conditions and then round them to their respective closest number. How do i possible go about this?

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Answer 1

KSSV 2016-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/304995-comparing-my-array-to-two-variables#answer_236600

在 MATLAB Online 中打开

% Generate random data between -3 and 3 
a = -3;
b = 3;
r = (b-a).*rand(100,1) + a;
r(r>2) = 2 ; % Change numbers greater then 2 
r(r<0) = 0 ;% Change numbers less then 0

Read about find, round, ceil, floor.

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Matlabhelp 2016-9-29

Thank you for you help :)

Stephen23 2016-9-29

编辑：Stephen23 2016-9-29

Note that this answer does not mention the simplest solution. See my answer.

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Answer 2

Stephen23 2016-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/304995-comparing-my-array-to-two-variables#answer_236604

编辑：Stephen23 2016-9-29

在 MATLAB Online 中打开

Simply use max and min, each with two arguments:

>> M = randi([-5,5],6)
M =
    -5     3     5    -5    -5    -2
     2     3     2    -4    -1    -1
    -5     2     3    -4     0    -5
    -5    -4    -1    -1    -1     5
     0     2    -1     4     2    -4
    -4     0     4     3     1    -4
>> min(2,max(0,M))
ans =
     0     2     2     0     0     0
     2     2     2     0     0     0
     0     2     2     0     0     0
     0     0     0     0     0     2
     0     2     0     2     2     0
     0     0     2     2     1     0