ty_淡淡587 2021-08-01 08:57 制作流程1黄豆清水泡发，入开水锅焯熟捞出。黄豆芽入锅焯熟。五花肉、鲜香菇洗净切成半厘米见方的小丁。心里美萝卜、白萝卜、黄瓜去皮切丝。芹菜、香椿洗净切小段。2炒锅上火倒油烧
I\'ve got a data frame in R, and I\'d like to perform a calculation on all pairs of rows. Is there a simpler way to do this than using a nested for loop?
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