choosing values with criteria from a set of values given
2 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
hi, i need some help here. can someone teach me how to do the following?
for example, i have a set of values a = [ 1 5 6 10 15], then i have another set of values b = [ 1 0.8 0 -0.8 -1.8] , another set c = [3 2.4 0 -2.4 -5.4].
how do i do when i want the answer to be 'a' if the values in c is greater than a or 'b' if the values in c is less than a?
in this example the expected ans should be 'd' [ 1 0.8 0 -0.8 -1.8] ? how do i make that?
0 Kommentare
Antworten (3)
Stalin Samuel
am 12 Jan. 2015
a = [ 1 5 6 10 15], b = [ 1 0.8 0 -0.8 -1.8] c = [3 2.4 0 -2.4 -5.4]
a1=sum(a) b1= sum(b) c1=sum(c) if c1>b1 result=a elseif c1<a1 result=b end
Guillaume
am 12 Jan. 2015
Use logical indexing. The expression c>a returns a logical array the same size as a and c with 1 where c is greater than a and 0 otherwise.
If you use this logical array to index into another array (e.g. a), then you only get those value of this other array for which the logical array is 1. Hence
a(c>a)
returns only those values of a where c is greater than a.
One possible solution is thus:
d = b
d(c>a) = a(c>a);
Note that you haven't said what should happen when a is equal to c, the above code assumes you want b.
0 Kommentare
Siehe auch
Kategorien
Mehr zu Creating and Concatenating Matrices finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!