How can I compare all row in a column with a value and replace it?

Question

bkshn 2015-6-17

0
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https://ww2.mathworks.cn/matlabcentral/answers/224157-how-can-i-compare-all-row-in-a-column-with-a-value-and-replace-it

回答： Walter Roberson 2015-6-17

Hello

I want to compare all row in one column with a value, and if one of them being larger than value, I want replace it with value.

How can I do this with if statement or any other way ?

if(path(1,:)>value)

? ???

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Answer 1

Walter Roberson 2015-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/224157-how-can-i-compare-all-row-in-a-column-with-a-value-and-replace-it#answer_182934

在 MATLAB Online 中打开

is_greater = path(1,:) > value;

Now if you want to replace the entire column with the value then:

if any(is_greater)
  path(1,:) = value;
end

If you want to replace only the locations then

path(1,is_greater) = value;

However, there is another way for the situation where you want to take the current item provided it is not greater than value, and value otherwise: you can use

path(1,:) = min(path(1,:), value);

and you can do the entire array at once with

path = min(path, value);

When you use min() the replacement is always the cutoff value. When you use the logical indexing I showed, the replacement could be arbitrary, such as

path(1,is_greater) = 0;