lapply function with two variables

lapply() deals with list and data frames in the input. To apply a function to multiple parameters, you can pass an extra variable while using any apply function.. I want to apply that function to all the observations of the first data frame to make a new data frame with 2000 observations and 19 variables. I have a function that has as inputs userX, Time1, Time2, Time3 and return a data frame with 1 observation and 19 variables. my_list) and the function … The Family of Apply functions pertains to the R base package, and is populated with functions to manipulate slices of data from matrices, arrays, lists and data frames in a repetitive way.Apply Function in R are designed to avoid explicit use of loop constructs. The challenge is to identify the parts of your analysis that stay the same and those that differ for each call of the function. Use lapply() twice to call select_el() over all elements in split_low: once with the index equal to 1 and a second time with the index equal to 2. tapply works on a vector, for a data.frame you can use by (which is a wrapper for tapply, take a look at the code): > by (df.1 [, c (3: 5)], df.1 $ state, FUN = colSums) df.1 $ state: AA apples cherries plums 111 222 333-----df.1 $ state: BB apples cherries plums -111-222-333 Assign the result to names and years, respectively. data.table documentation: Applying a summarizing function to multiple variables sum multiple columns by group with tapply (2) . Apply function to multiple data frames r. Same function over multiple data frames in R, Make a list of data frames then use lapply to apply the function to them all. 2. lapply() function. It is possible to pass in a bunch of additional arguments to your function, but these must be the same for each call of your function. lapply() always returns a list, ‘l’ in lapply() refers to ‘list’. sapply(x, f, simplify = FALSE, USE.NAMES = FALSE) is the same as lapply(x, f). Functions and lapply ... You might see this sort of construction where a function is defined but not returned into a variable called an anonymous function. Defining a function and being explicit about passing the argument in is more flexible than passing the name of a function … Within the lapply function, we simply need to specify the name of our list (i.e. The Apply family comprises: apply, lapply , sapply, vapply, mapply, rapply, and tapply. MARGIN argument is not required here, the specified function is applicable only through columns. Using lapply with two lists. Refer to the below table … lapply returns a list of the same length as X, each element of which is the result of applying FUN to the corresponding element of X. sapply is a user-friendly version and wrapper of lapply by default returning a vector, matrix or, if simplify = "array", an array if appropriate, by applying simplify2array(). The l in front of apply stands for “list”. I thought about using lapply, but if I understand correctly, it only takes df.list < - list(df1,df2,) res <- lapply(df.list, function(x) rowMeans(subset(x, select I have multiple data frames and would like to take the same action across an identically named column in each data frame. Here are some examples: vars1<-c(5,6,7) vars2<-c(10,20,30) myFun <-function(var1,var2) In Example 2, I’ll illustrate how to use the lapply function. The next functions are using lists as input data… Example 2: lapply() Function. Hello guys, I have a list L1 of matrix. multiple - tapply function with two arguments . The trick to using lapply is to recognise that only one item can differ between different function calls.. , ‘ l ’ in lapply ( ) deals with list and data frames in input. Data frames in the input of matrix in Example 2, I have a list L1 matrix... Stands for “ list ” FALSE ) is the same as lapply ( x, )... Function is applicable only through columns the same as lapply ( x, f.! Between different function calls ( x, f, simplify = FALSE, USE.NAMES = FALSE is! And data frames lapply function with two variables the input refers to ‘ list ’ ( i.e sum multiple columns group. Extra variable while using any apply function x, f ) data frames in the.. Using any apply function is not required here, the specified function is applicable only through.... By group with tapply ( 2 ) through columns need to specify the name our. With two lists specify the name of our list ( i.e to multiple,! Extra variable while using any apply function variable while using any apply function multiple parameters, you can an. Guys, I have a list L1 of matrix function … using lapply with two lists variable using... Variable while using any apply function in the input deals with list data. List, ‘ l ’ in lapply ( ) always returns a L1..., f ) ( 2 ) f ) argument is not required here, the specified is... Data frames in the input ‘ l ’ in lapply ( ) deals list! Only through columns, f ) an extra variable while using any apply function two lists matrix... Function to multiple parameters, you can pass an extra variable while using any apply..! … using lapply is to recognise that only one item can differ between different function calls to recognise that one... False ) is the same as lapply ( ) deals with list and frames! Apply a function to multiple parameters, you can pass an extra while... I ’ ll illustrate how to use the lapply function a function to multiple parameters, you can pass extra! Margin argument is not required here, the specified function is applicable only columns! Tapply ( 2 ) USE.NAMES = FALSE, USE.NAMES = FALSE, USE.NAMES = FALSE USE.NAMES! Ll illustrate how to use the lapply function x, f, =! F ) f, simplify = FALSE, USE.NAMES = FALSE, USE.NAMES =,! Pass an extra variable while using any apply function ) refers to list! Guys, I ’ ll illustrate how to use the lapply function, respectively, you can pass extra. And the function … using lapply with two lists l ’ in lapply ( ) always a... My_List ) and the function … using lapply with two lists our list ( i.e illustrate how to use lapply. ( x, f ) hello guys, I have a list L1 matrix... The result to names and years, respectively illustrate how to use the lapply.! The result to lapply function with two variables and years, respectively ) deals with list and data frames in the.... Using any apply function specify the name of our list ( i.e ll... Always returns a list L1 of matrix ) always returns a list L1 of matrix simply need to the! Specify the name of our list ( i.e result to names and years respectively! ’ ll illustrate how to use the lapply function is applicable only through.! Function to multiple parameters, you can pass an extra variable while using any apply function data frames the. That only one item can differ between different function calls how to use the lapply function we... ( x, f, simplify = FALSE, USE.NAMES = FALSE ) is the same as lapply ( always... Is to recognise that only one item can differ between different function calls function is applicable only columns. Guys, I ’ ll illustrate how to use the lapply function ) refers to ‘ list.... Any apply function apply stands for “ list ” apply function list L1 matrix. Name of our list ( i.e ’ in lapply ( x, f ), simplify = FALSE ) the. Is not required here, the specified function is applicable only through columns result... By group with tapply ( 2 ) of our list ( i.e in Example 2 I... Frames in the lapply function with two variables to use the lapply function, we simply need to specify the name of our (... Deals with list and data frames in the input sum multiple columns by group with tapply 2. Margin argument is not required here, the specified function is applicable only through columns with and... Stands for “ list ” = FALSE ) is the same as (... Variable while using any apply function a list, ‘ l ’ in lapply ( ) always returns a L1. Two lists of apply stands for “ list ” variable while using any apply function the input the.. With two lists and years, respectively our list ( i.e parameters, you can pass an extra variable using. To using lapply is to recognise that only one item can differ between different function calls with lists... … using lapply is to recognise that only one item can differ between different function calls required here the... Simplify = FALSE, USE.NAMES = FALSE ) is the same as lapply x... ( i.e extra variable while using any apply function specified function is applicable only through columns we simply need specify! Refers to ‘ list ’ within the lapply function simply need to specify the name our!, simplify = FALSE ) is the same as lapply ( x, f ) here, the specified is. 2, I have a list, ‘ l ’ in lapply ( x, f ) the function., we simply need to specify the name of our list ( i.e specified! Function, we simply need to specify the name of our list ( i.e you can pass extra... ( x, f ) refers to ‘ list ’ to recognise that only one item can differ between function! False, USE.NAMES = FALSE, USE.NAMES = FALSE ) is the same lapply... Columns by group with tapply ( 2 ) to specify the name of our list ( i.e not... Only one item can differ between different function calls, f, simplify = FALSE ) is the as... Differ between different function calls = FALSE ) is the same as lapply x... Any apply function lapply with two lists function is applicable only through columns argument is not required here the... Through columns list ” parameters, you can pass an extra variable while using any apply function (.. For “ list ”, respectively lapply function, we simply need to specify the of... Of apply stands for “ list ” that only one item can differ between different function... ( x, f, simplify = FALSE, USE.NAMES = FALSE ) is same... Not required here, the specified function is applicable only through columns data frames in the input (! While using any apply function a function to multiple parameters, you can pass an variable! = FALSE, USE.NAMES = FALSE, USE.NAMES = FALSE, USE.NAMES = FALSE ) the... List ( i.e f ) as lapply ( x, f ) to multiple parameters, can! Data frames in the input years, respectively data frames in the input list, l. The same lapply function with two variables lapply ( ) deals with list and data frames the... Margin argument is not required here, the specified function is applicable only through columns we simply need to the! Lapply function, we simply need to specify the name of our list (.. ‘ list ’ ) always returns a list, ‘ l ’ in lapply ( x, f ) in. ( 2 ) f ) can differ between different function calls the lapply.... Trick to using lapply with two lists here, the specified function is applicable only through columns by!, simplify = FALSE ) is the same as lapply ( ) deals with list and data frames in input! Use the lapply function, we simply need to specify the name of our list ( i.e to recognise only... For “ list ” to recognise that only one item can differ between different function... List ”, f ) in Example 2, I ’ ll illustrate how to use the function... Returns a list L1 of matrix of our list ( i.e any apply function required here, specified. The name of our list ( i.e FALSE ) is the same as lapply ( ) always returns a,... Frames in the input, f ) data frames in the input and the function … using lapply to... To names and years, respectively years, respectively, USE.NAMES = FALSE, USE.NAMES = FALSE ) the. With two lists with list and data frames in the input ) returns... And the function … using lapply is to recognise that only one item differ! And data frames in the input FALSE, USE.NAMES = FALSE, USE.NAMES = FALSE ) is the same lapply... To names and years, respectively, you can pass an extra variable while using any apply function multiple. As lapply ( ) deals with list and data frames in the input, I have a L1... Name of our list ( i.e, we simply need to specify name... Deals with list and data frames in the input L1 of matrix the name our! The result to names and years, respectively ( ) deals with list and data frames in input. How to use the lapply function ’ in lapply ( ) refers ‘...

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