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The function read.csv() imports data into
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May 27, 2019
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Data Handling
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tempuser
#datahandling
DataHandling-questions-answers
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For a given matrix mat, how do you increment every element of the matrix by 3 and return a vector. (I) sapply(mat, function(x,y) sum(x)+y,y=3) (II) sapply(mat, function(x) sum(x)+3)
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May 27, 2019
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Data Handling
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tempuser
#datahandling
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What will the following lines of code return x <- matrix(1:18, 6, 3) apply(x, 2, sum)
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May 27, 2019
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Data Handling
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tempuser
#datahandling
DataHandling-questions-answers
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Which function is used over the margins of an array
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May 27, 2019
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Data Handling
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tempuser
#datahandling
DataHandling-questions-answers
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A hospital data contains patient's age and treatment they are undergoing. Which function can be used to find average of patients undergoing each of the treatments?
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May 27, 2019
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Data Handling
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tempuser
#datahandling
DataHandling-questions-answers
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Applying lapply function on a matrix returns
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May 27, 2019
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Data Handling
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tempuser
#datahandling
DataHandling-questions-answers
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Which function is very similar to lapply?
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May 27, 2019
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Data Handling
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tempuser
#datahandling
DataHandling-questions-answers
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Which function can be used when a vector needs to be split into groups defined by a classifying factor, compute a function on the subsets, and return the results?
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May 27, 2019
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Data Handling
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tempuser
#datahandling
DataHandling-questions-answers
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