if difference between two values is smaller than replace by

Question

Kai 2023-10-22

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https://ww2.mathworks.cn/matlabcentral/answers/2036971-if-difference-between-two-values-is-smaller-than-replace-by

评论： Dyuman Joshi 2023-10-23

I have a vector that contains several time values. For the application I need to check if the difference between two values is smaller than 3e-6. If that's the case the second (higher) value shall be replaced with the first.

My approach would be for-loops but maybe there is a smarter and more efficient way to solve this?

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the cyclist 2023-10-22

在 MATLAB Online 中打开

time.mat

Is each column processed independently?

As @Dyuman Joshi asked, do you only need to check consecutives values?

It doesn't seem that any value is greater than the immediately preceding value by less than 3.e-6, but more than zero:

load("time.mat","time")
any((diff(time) > 0) & (diff(time) < 3.e-6),"all")
ans = logical
   0

Walter Roberson 2023-10-22

编辑：Walter Roberson 2023-10-22

在 MATLAB Online 中打开

time.mat

load("time.mat","time")
dt = diff(time);
dt = dt(dt ~= 0);
min(dt)
ans = 1.3500e-05

So in all cases where the difference in times is < 3e-6, the two values are already identical.

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Answer 1

Pratyush 2023-10-23

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在 MATLAB Online 中打开

Hi Kai,

I understand that you have a vector, and if the difference between any two values is less than 3e-6, you want to set them both equal to the lesser of the two numbers. The following script could be used for that purpose:

% Sort timeValues vector
timeValues = sort(timeValues);
% Calculate the differences between adjacent values
diffValues = diff(timeValues);
% Find the indices where the differences are smaller than 3e-6
replaceIndices = find(diffValues < 3e-6);
% Replace the second value with the first for the identified indices
timeValues(replaceIndices + 1) = timeValues(replaceIndices);