我想实现下面功能:
update factors set factor8 = factor8-dot(factors.factor2,factors.factor8)/dot(factors.factor2,factors.factor2)*factor2 from factors context by secID
写到
update!(factors, i, factors[s]-dot(factors[i],factors[s])/dot(factors[i],factors[i])*factors[i])
是这样,但缺context by。请教一下在DolphinDB database中怎么实现?
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…