How to modify values in an array at a certain point inside a loop?

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I have formed this simple code
clc
clear all
a=1.4
for i=1:10 %Here i represents years
A(:,:,i)=a; %For storing the values in 3D matrix
a = a * 0.9;
end
The answer I am getting is
val(:,:,1) =
1.4000
val(:,:,2) =
1.2600
val(:,:,3) =
1.1340
val(:,:,4) =
1.0206
val(:,:,5) =
0.9185
val(:,:,6) =
0.8267
val(:,:,7) =
0.7440
val(:,:,8) =
0.6696
val(:,:,9) =
0.6027
val(:,:,10) =
0.5424
I want to modify my code such that when the value of 'a' becomes less than a<0.6*1.4 so for that year 'a' should be 1.4 again.Like in this case in year 6 the value is 0.8267 which is less than 0.6*1.4 so val(:,:,6) should become 1.4 and then again the 'a' will be calculated as per defined equation.I mean I want my answer like this and also I want the year in which the value becomes 1.4 again like here in this case the year is 6.How can I modify my code in order to get this answer?Kindly help me
Desired Answer:
val(:,:,1) =
1.4000
val(:,:,2) =
1.2600
val(:,:,3) =
1.1340
val(:,:,4) =
1.0206
val(:,:,5) =
0.9185
val(:,:,6) =
1.4000
val(:,:,7) =
1.2600
val(:,:,8) =
1.1340
val(:,:,9) =
1.0206
val(:,:,10) =
0.9185

采纳的回答

darova
darova 2020-6-30
Just add if condition inside your for loop
clc
clear all
a=1.4
for i=1:10 %Here i represents years
A(:,:,i)=a; %For storing the values in 3D matrix
a = a * 0.9;
if a < 1.4*0.6
a = 1.4;
end
end
  2 个评论
Rabia Zulfiqar
Rabia Zulfiqar 2020-6-30
Thankyou so much for your help dear. Can you also please idntify that how would I know the year where this replcament has been done?
For instance I know that I can do something like this
b=find(A==1.4);
B=b(2);
and then B should be equal to 6 but is there any other way to find this year?
darova
darova 2020-7-1
You are doing ok, It's the right wayt to find the year. Why do you want another method?
The only thing: use some tolerance since you have float numbers
Find
ind = find(abs(A-1.4)<0.01);
B = b(ind);

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