Determine how many times numbers in a certain range were drawn
4 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Hi All I have a 52,1 matrix populated with random matrix.
I want to be able to count the sum of a range, for example I want to be able to sum the values between the (3,1) and (6,1)
I tried using the code range=sum(matrixname(lowvalue:highvalue))
but that does not work
Any suggestions are appreciated
Thanks!
Rich
3 Kommentare
Evan
am 23 Jul. 2013
When you say "that does not work" what do you mean? Do you get an error? Is this value returned simply wrong?
Image Analyst
am 24 Jul. 2013
And what does it mean to count the sum? The sum is the total of the numbers. What is the "count" of that?
Antworten (1)
dpb
am 23 Jul. 2013
On the assumption the (3,1) refers to the subscript of the array (and, btw, the "1" is superfluous for the 1D dimension for vectors, use just "(3)" instead),
>> x=rand(52,1);
>> x(2:7)'
ans =
0.7138 0.8844 0.7209 0.0186 0.6748 0.4385
>> sum(x(3:6))
ans =
2.2986
>> nlow=3;nhi=6;
>> sum(x(nlow:nhi))
ans =
2.2986
>>
If, instead you mean the between the values stored at those locations, then use logical addressing...since don't know the magnitudes of the values at those locations, to do logic on them will need to find the larger/smaller first...
>> xlo=min(x(nlow),x(nhi))
xlo =
0.6748
>> xhi=max(x(nlow),x(nhi))
xhi =
0.8844
>> (x(x>=xlo & x<=xhi))
ans =
0.7138
0.8844
0.7209
0.6748
0.8147
0.7223
0.8319
0.8593
0.8266
0.8186
>> sum(x(x>=xlo & x<=xhi))
ans =
7.8673
>>
Of course, your answers will be different depending on the values returned by rand()
5 Kommentare
Siehe auch
Kategorien
Mehr zu Logical 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!