Loop
if (expr_1) expr_2 else expr_3
for (name in expr_1) expr_2
for (i in 1:length(yc)) {
plot(xc[[i]], yc[[i]])
abline(lsfit(xc[[i]], yc[[i]]))
}
while (condition) expr
if (expr_1) expr_2 else expr_3
for (name in expr_1) expr_2
for (i in 1:length(yc)) {
plot(xc[[i]], yc[[i]])
abline(lsfit(xc[[i]], yc[[i]]))
}
while (condition) expr