(2 replies) Dear list, I have the function (as a simple example, which is actually part of a larger function) pres.test<-function(N0=N0, N1=N1) { dt<-5 r<-log(N1/N0)/dt r } which calculates the annual growth rates in a population Where N0 is the population classified into age intervals, say 5 years, at time 95, and N1 is the population by 5 year age classes at time 00. E.g., for a matrix 1 indicates rows, 2 indicates columns, c(1, 2) indicates rows and columns. See Also. outer, which applies a vectorized function to all combinations of two arguments. Arguments with classes in ... will be accepted, and their subsetting and length methods will be used. R. Michael Weylandt There's a slight variant that might be even more helpful if you need to line the data up with how you started: ave(). See Also. or user-defined function. sapply, after which mapply() is modelled. 4.0.2 Example 2: Combining functions. tapply: Apply a Function Over a Ragged Array Description Usage Arguments Details Value Note References See Also Examples Description. x and y both have two values so the function is called twice. tapply Function. You use tapply() to create tabular summaries of data. Arguments with classes in ... will be accepted, and their subsetting and length methods will be used. A list, or for SIMPLIFY = TRUE, a vector, array or list. It takes in two parameters x and y. Value. a vector giving the subscripts which the function will be applied over. I was trying to figure out how to use sapply for a function I wrote with multiple arguments. The function can be any inbuilt (like mean, sum, max etc.) Suppose the function is called FUN(a,b), where "a" is a number and "b" is a number You can use mapply(FUN, a = VECTOR, b = VECTOR) where each vector is your input arguments. Arguments X. an array, including a matrix. Where X has named dimnames, it can be a character vector selecting dimension names.. FUN However, table() can create only contingency tables (that is, tables of counts), whereas with tapply() you can specify any function as the aggregation function. To understand clearly lets imagine you have height of 1000 people ( 500 male and 500 females), and you want to know the average height … Examples This is a little bit similar to the table() function. In this example, I created a function that returns a vector ofboth the mean and standard deviation. MARGIN. Examples The values of x come from the second argument (x=c(2,3)) and the values of y come from the 3rd argument (y=c(3,4)). A list, or for SIMPLIFY = TRUE, a vector, array or list. So here’s how it goes – the first argument is the function FUN. I'll let you work out the details, but the key difference is that it returns a vector that has the 90th percentile for each group, each time that group appears, instead of the summary table that you'd get from tapply() Michael On Tue, Nov … tapply() is used to apply a function over subsets of a vector. Requires explanation, doesn’t it? sapply, after which mapply() is modelled. Each of the apply functions requires a minimum of two arguments: an object and another function. Value. Basically, tapply() applies a function or operation on subset of the vector broken down by a given factor variable. outer, which applies a vectorized function to all combinations of two arguments. You can create a function like this for any apply function, not just tapply. Apply a function to each cell of a ragged array, that is to each (non-empty) group of values given by a unique … I can actually answer this!! It will output a vector or a matrix (depending on the output of your function). 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