Subtracting values form rows with same variable

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Marcel-Maximilian
Marcel-Maximilian 2022-10-27
评论： Marcel-Maximilian 2022-11-24
I need to subtract the "mean_Testvalue" from "GENE" A from every other GENE (B,C,D,...) that has the same "TIME" string.
So for example GENE B "diff1 day60" needs to be substracted by the value of GENE A "diff1 day60".
How can i automate this process?
Thank you in advance! :)
  2 个评论
Marcel-Maximilian
Marcel-Maximilian 2022-10-27
I thought about that the problem is i am kinda new to MATLAB and don't really know how i would have to design such a loop.

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采纳的回答

Rik
Rik 2022-10-27
If you have trouble with Matlab basics you may consider doing the Onramp tutorial (which is provided for free by Mathworks).
It sound to me like you need a nested loop. I outlined the idea below.
for row1=1:(size(data,1)-1)
% extract timestamp on this row
for row2=(row1+1):size(data,1)
% extract timestamp on this row
if % test if timestamps match
% apply subtraction and store back to table
end
end
end
  1 个评论
Marcel-Maximilian
Marcel-Maximilian 2022-11-24
I am really sorry for the late response. Was quite busy.
Your idea did the trick. Thank you very much. :)

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更多回答（1 个）

RAJA SEKHAR BATTU
RAJA SEKHAR BATTU 2022-10-27
编辑：RAJA SEKHAR BATTU 2022-10-27
Hi @Marcel-Maximilian,
I am not sure about categorical loop
but you can write for loop like below
index1=GENE('A');
index2=GENE('B');
index3=GENE('C');
index4=GENE('D');
x=zeros(index2,1);
y=zeros(index3,1);
z=zeros(index4,1);
for i = 1: length(GENE)
if GENE == 'B'
x(i) = mean_Testvalue(index2) - mean_Testvalue(Index1);
elseif GENE == 'C'
y(i) = mean_Testvalue(index3) - mean_Testvalue(Index1);
elseif GENE == 'D'
z(i) = mean_Testvalue(index4) - mean_Testvalue(Index1);
end
end
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RAJA SEKHAR BATTU
RAJA SEKHAR BATTU 2022-10-27
Yes,
I mean to save the substracted values in variables
these variables can be used to manipulate in rows or coloumns
Rik
Rik 2022-10-27
Ran in:
The variable or function GENE does not depend on your loop variable, so each iteration will execute the same branch. You should also avoid using == for text comparisons, as that may result in unexpected results:
if 't'=='tt'
disp('did you expect this outcome?')
else
disp('or this one?')
end
did you expect this outcome?

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