MATLAB: First adjacent difference greater than a certain value

first differencegradientmax difference

I have a table of measurements and the corresponding depth where the measurements were taken. I want to find the first location where the difference between two adjacent measurements is greater than a certain value.

For example, if I set the max difference to be 1 and I have

Depth Temp

12 cm 2

10 cm 1.3

8 cm 1.8

6 cm 0.5

4 cm -1.2

2 cm -2.5

I want it to return 6 cm, because that is the first place where the difference between adjacent temperatue values is greater than 1

Is there a command that would allow me to do this?

Best Answer

TabLE.Depth(find(abs(diff(TabLE.Temp)) > 1, 1) + 1)

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MATLAB: Hi, i’m trying to make a condition that states ‘only if the difference between two values is greater than 0.1 then plot’. What would be the code for this? Thanks :)

NaN's are not plotted, so you just need to convert those values to NaN:

>> V = [0,1,2,3,3.5,4,5,6,7,7.5,8,8.5,9,10,11,12];
>> D = diff(V)<1; % values closer than one
>> V([D,false] | [false,D]) = NaN;
>> plot(V,'-*')

MATLAB: Comparing the array to a certain range

clc; clear all ;
% generate random data netween 0 and 2 
a = 0;
b = 3;
r = (b-a).*rand(20,1) + a;
r(r>1 & r< 2) = 2 ;  % replace numbers greater then 1 and less then 2 with 2

read about find

Best Answer

Related Solutions

MATLAB: Hi, i’m trying to make a condition that states ‘only if the difference between two values is greater than 0.1 then plot’. What would be the code for this? Thanks :)

MATLAB: Comparing the array to a certain range

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