element wise operation column matrix

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vishakha nagarajan
vishakha nagarajan 2021-5-25
评论： Stephan 2021-5-25
I have a column matrix of data , Temp_data= [20;27;29;33;40] , i want to subtract each element i, by the first element (i.e 20-20; 27-20; 29-20;33-20), how do i do this?
also, how to do the similar operation if i have to subtract consequtive elements, i.e A(n) - A(n-1) [ex: 20-20; 27-20; 29-27....]

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回答（2 个）

Stephan
Stephan 2021-5-25
Ran in:
Temp_data= [20;27;29;33;40]
Temp_data = 5×1
20 27 29 33 40
Case_1 = Temp_data - Temp_data(1)
Case_1 = 5×1
0 7 9 13 20
Case_2 = diff(Temp_data)
Case_2 = 4×1
7 2 4 7
Stephen23
Stephen23 2021-5-25
Ran in:
T = [20;27;29;33;40];
A = T - T(1)
A = 5×1
0 7 9 13 20
B = [0;diff(T)]
B = 5×1
0 7 2 4 7
  1 个评论
Stephan
Stephan 2021-5-25
I thought about adding zero as first elemnt, since it is part of the desired result. But i think it does not meet the rquirement of A(n) - A(n-1) - so we'll see

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