This is the sample data: ID CHF CHF_FU 1 0 23 2 1 14 3 0 8 4 0 5 ID is patient ID. CHF is whether the patient has the disease, and CHF_FU indicates years of follow-up in the study. I want to create an array of 23 (Max of the years of follow-up) that has 23, 8, and 5 zeros for patients 1, 3, and 4, respectively. For the second patient, I want the array to have 13 zeros and in the fourteenth column a 1: ID CHF1 CHF2 CHF3 CHF4 CHF5 CHF6 CHF7 CHF8 CHF9 CHF10 CHF11 CHF12 CHF13 CHF14 ... CHF22 CHF23 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 1 . . . .
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