storing The for loop data

Question

Prasad Joshi 2022-2-9

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1646060-storing-the-for-loop-data

评论： Prasad Joshi 2022-2-9

How can I stored the for loop data ...for each loop..Its overwriting the previous data .. I am storing in C..But it is taking only last loop by overwriting previous values any inputs how can I do this ...Thank you in Adance ...any improvement in code can someone suggest

clear all

close all

clc

A=xlsread('Compare_All_cases','B1:AB37');

B=[]

for i= 1:12

B=[B;A(i,:)]

end

for i=1:3:12

effi1=(B(i,:)-B((i+1),:))./(B(i,:))*100

effi2=(B((i+1),:)-B((i+2),:))./(B((i+1),:))*100

effi3=(B(i,:)-B((i+2),:))./(B(i,:))*100

C=vertcat(effi1,effi2,effi3);

end

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Answer 1

KSSV 2022-2-9

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1646060-storing-the-for-loop-data#answer_891935

编辑：KSSV 2022-2-9

在 MATLAB Online 中打开

The below line

A=xlsread('Compare_All_cases','B1:AB37');
B=[]
for i= 1:12
    B=[B;A(i,:)]
end

can be achieved by:

A=xlsread('Compare_All_cases','B1:AB37');
A = A' ;
B = A(:) ;

The rest of the lines:

for i=1:3:12
effi1=(B(i,:)-B((i+1),:))./(B(i,:))*100
effi2=(B((i+1),:)-B((i+2),:))./(B((i+1),:))*100
effi3=(B(i,:)-B((i+2),:))./(B(i,:))*100
C=vertcat(effi1,effi2,effi3);
end 

can be used:

C = cell([],1) ;
count = 0; 
for i=1:3:12
    count = count+1 ;
effi1=(B(i,:)-B((i+1),:))./(B(i,:))*100
effi2=(B((i+1),:)-B((i+2),:))./(B((i+1),:))*100
effi3=(B(i,:)-B((i+2),:))./(B(i,:))*100
C{i}=vertcat(effi1,effi2,effi3);
end 