You need to use sum(), example below:
IndexStart <- 1 x <- seq(IndexStart, 6, 1) xm <- 1 result1 <- ((x[1]-xm)^2)+((x[2]-xm)^2)+((x[3]-xm)^2)+((x[4]-xm)^2)+((x[5]-xm)^2)+((x[6]-xm)^2) print(result1) # [1] 55 result2 <- sum((x-xm)^2) # <- Solution print(result2) # [1] 55
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