Creating new table from another table

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Colin Leonelli
Colin Leonelli 2021-9-18
回答： Star Strider 2021-9-18
I have a 4 column table with ages, FEV values, Heights and the last has 1s or 0s. 1 means they smoke, 0 means they don't.
I need to make a new table with ages 11 and up, who smoke, and include their FEV values

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Star Strider
Star Strider 2021-9-18
Ran in:
There are several ways to do this, including using the findgroups function.
A relatively efficient way is just to do the comparisons to create a logical vector (‘Lv’ here), and go with that —
T0 = table(randi([5 90],20,1), 100*rand(20,1),randi([100 200],20,1),randi([0 1],20,1), 'VariableNames',{'Age','FEV_1','Height','Smokes'})
T0 = 20×4 table
Age FEV_1 Height Smokes ___ _______ ______ ______ 77 55.903 160 1 11 0.77497 112 1 77 10.859 132 1 65 82.203 173 1 48 58.998 103 0 62 92.198 162 1 87 22.737 183 0 10 39.319 176 0 31 23.808 113 1 86 29.428 145 0 67 54.328 116 1 78 31.662 121 0 5 33.127 123 1 82 77.932 138 0 5 32.548 145 0 22 35.402 200 1
Lv = T0{:,1}>=11 & T0{:,4}==1;
T1 = T0(Lv,:)
T1 = 11×4 table
Age FEV_1 Height Smokes ___ _______ ______ ______ 77 55.903 160 1 11 0.77497 112 1 77 10.859 132 1 65 82.203 173 1 62 92.198 162 1 31 23.808 113 1 67 54.328 116 1 22 35.402 200 1 34 19.997 133 1 12 78.177 113 1 19 66.497 185 1
Experiment to get different results.
.

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