[R] optimized R-selection and R-replacement inside a matrix

Hello, I need to modify some huge arrays (2000 individuals x 50 000 variables). To format the data, I think I should benefit from optimized R-selection and R-replacement inside a matrix and prohibite a naive use of loops. Thank you in advance for providing information about the following proble

[R] optimized R-selection and R-replacement inside a matrix need, strings coerced to factors

Hello, I need to modify some huge arrays (2000 individuals x 50 000 variables). To format the data, I think I should benefit from optimized R-selection and R-replacement inside a matrix and prohibite a naive use of loops. Thank you in advance for providing information about the following proble

[R] optimized R-selection and R-replacement inside a matrix need, strings coerced to factors

Hello, I encounter two problems : First, I need to modify some huge arrays (2000 individuals x 50 000 variables). To format the data, I think I should benefit from optimized R-selection and R-replacement inside a matrix and prohibite a naive use of loops. Thank you in advance for providing