Re: [R] How to select max data according to week?

Dear All, Thank you very much for helping me.. i will try my best by using all suggestion.. thank you again.. hopefully is work. - Original Message - From: "Eric Berger" To: "Marc Schwartz" Cc: "Bert Gunter" , "R-help" , "SITI AISYAH BI

[R] How to select max data according to week?

Hi, I'm Aisyah..I have a problem to run my R coding. I want to select maximum value according to week. here is my data Date O3_Conc 21010.033 21020.023 21030.025 21040.041 21050.063 21060.028 21070.068