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How do I substract like variables from each other

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Elysia
Elysia 2022-12-2
回答： Voss 2022-12-3
I have a table that looks like Book1_1, I need help with figuring out if Var1 row 1 ==Var1 row 2 then subtract Var2 row 2 from Var2 row 1 and continue down till the end of the table (this subtract answer would then create a new variable but I do not need help with creating a new variable just how to subtract likes from likes). Thank you.

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回答（2 个）

Arif Hoq
Arif Hoq 2022-12-2
Ran in:
one approach:
a=readmatrix("Book1.xlsx");
b= datetime(a,'ConvertFrom','excel');
% b(:,3)=b(:,2);
for i=1:size(b,1)-1
if b(i,1)==b(i+1,1)
c(i)=b(i+1,2)-b(i,2);
end
end
output=c'
output = 5×1 duration array
00:05:00 00:04:49 00:10:10 00:00:00 00:02:19
Voss
Voss 2022-12-3
Ran in:
a = readmatrix("Book1.xlsx");
b = datetime(a(:,2),'ConvertFrom','excel');
N = size(a,1);
c = duration(NaN(N,3));
for i = 1:N-1
if a(i,1) == a(i+1,1)
c(i+1) = b(i+1)-b(i);
end
end
disp(c);
NaN 00:05:00 00:04:49 00:10:10 NaN 00:02:19

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