آموزش R درس ۳۳: معرفی دیتافریم و روش تولید و دستیابی به عناصر آن

New channel Ali Mesforoush: title sample judged 'whole' (Nearly all uploads are structured numbered lessons teaching numerical analysis, machine learning, R programming, and cal); passed a second screen for sellers/exam-prep/re-uploads; 2 of 3 sampled transcripts showed teaching, 0 not; every title checked strictly; oEmbed verified.