If statement using vectors
192 views (last 30 days)
Show older comments
Alexandros Katsikogiannis
on 25 May 2019
Commented: Stephen23
on 27 May 2019
Hello,
I am trying to make an if statement that will check the values of vector "T_m", element by element, with vector "T_s". All variables are vectors of the same length 10080x1. The result should be a vector as well. The values that "P_actual" attain are always equal to "P", even though there are times that T_m is higher than T_s.
Here is the code:
if T_m > T_s
P_actual = P - 0.3*(T_m - T_s);
else
P_actual = P;
end
I would appreciate any sort of help or tips!
0 Comments
Accepted Answer
Stephen23
on 25 May 2019
Edited: Stephen23
on 25 May 2019
You cannot use if like that to operate element-wise on arrays (read the if help to know what your code is actually doing). You could use a loop, but that would be pointlessly complex for this simple task.
Method one: indexing:
P_actual = P - 0.3*(T_m-T_s);
idx = T_m>T_s;
P_actual(~idx) = P(~idx)
Method two: max:
P_actual = P - 0.3*max(0,T_m-T_s)
I recommend using the max method.
3 Comments
More Answers (1)
KALYAN ACHARJYA
on 25 May 2019
Edited: KALYAN ACHARJYA
on 25 May 2019
Your code doing the same
T_m=randi(6,1);
T_s=rand(6,1);
P=rand(6,1);
if T_m > T_s
P_actual = P - 0.3*(T_m - T_s);
else
P_actual = P;
end
Example 1: Here T_m>T_s
T_m =
1 2 3 4 5 6
T_s =
0.7224
0.1499
0.6596
0.5186
0.9730
0.6490
P =
0.8003
0.4538
0.4324
0.8253
0.0835
0.1332
P_actual =
0.7171 0.4171 0.1171 -0.1829 -0.4829 -0.7829
0.1988 -0.1012 -0.4012 -0.7012 -1.0012 -1.3012
0.3303 0.0303 -0.2697 -0.5697 -0.8697 -1.1697
0.6809 0.3809 0.0809 -0.2191 -0.5191 -0.8191
0.0754 -0.2246 -0.5246 -0.8246 -1.1246 -1.4246
0.0279 -0.2721 -0.5721 -0.8721 -1.1721 -1.4721
Example 2: Here T_m<=T_s (Else Condition P_actual = P)
T_m =
0.1734
0.3909
0.8314
0.8034
0.0605
0.3993
T_s =
1 2 3 4 5 6
P =
0.5269
0.4168
0.6569
0.6280
0.2920
0.4317
P_actual =
0.5269
0.4168
0.6569
0.6280
0.2920
0.4317
0 Comments
See Also
Categories
Find more on Creating and Concatenating Matrices in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!