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subset of dataset
Posted:
Dec 20, 2012 10:26 AM


Hi
I use the hospital data already in MATLAB to illustrate: >> load('hospital')
Simplified version of my problem follows. In reality I may want several criteria, not just two as below. If I want to pick out those patients Age = 38 I can: >> subset_Age38 = hospital(hospital.Age == 38,:)
If I want to pick out those patients Age = 39 I can: >> subset_Age39 = hospital(hospital.Age == 39,:)
If I want to pick out those patients Age = 38 AND 39 I try: subset_Age3839 = hospital(hospital.Age == [38 39],:)
but get the error Error using == Matrix dimensions must agree.
I can use the following work around, which gives me what I want: >> ages_to_view = [38 39]; >> [refs] = find(ismember(hospital.Age,ages_to_view)); >> subset_Age3839 = hospital(refs,:)
But is there a way to do this as I initially tried it? I don't want to use a 38  40, as I may have an awful lots of values to set as criteria.
Thanks Barry



