apply

问题 I would like to use apply to run across the rows of a matrix, and I would like to use the rowname of the current row in my function. It seems you can't use rownames , colnames , dimnames or names directly inside the function. I am aware that I can probably create a workaround based on information in this question. But my question is how does apply handle row and column names of the array in it's first argument, and the assignment of names to objects created inside the function called by apply

问题 I see that in different plugins and codes, but I don't understand what does that function... In the jQuery api isn't referenced! 回答1: apply calls a function with a set of arguments. It's not part of jQuery, it's part of core Javascript. However, there is mention of it in the jQuery docs: http://docs.jquery.com/Types#Context.2C_Call_and_Apply Syntax: somefunction.apply(thisObj, [argsArray]) The above calls the function somefunction , setting this to thisObj within the function's scope, and

问题 I have a pandas.DataFrame that looks like this. COL1 COL2 COL3 C1 None None C1 C2 None C1 C1 None C1 C2 C3 For each row in this dataframe I would like to count the occurrences of each of C1, C2, C3 and append this information as columns to this dataframe. For instance, the first row has 1 C1, 0 C2 and 0 C3. The final data frame should look like this COL1 COL2 COL3 C1 C2 C3 C1 None None 1 0 0 C1 C2 None 1 1 0 C1 C1 None 2 0 0 C1 C2 C3 1 1 1 So, I have created a Series with C1, C2 and C3 as the

问题 I have some trouble with generating .png from each rows of data frame. Basically, I want to rbind each one of the row of df to coordinate_sys . For each row of df together with coordinate_sys , a coordinate system and one a unit vector "J" should be generated like in this Finally, after generating a .png file for each unit_vector, I would like to make .gif animation. here is the reproducible code of my script; library(matlib) library(rgl) set.seed(12) x <- runif(10,-0.14,0.1) y <- runif(10,-0

问题 I created a page with dynamic content in pure javascript and angular in similar. I used apply method in javascript to reuse the function assigned to other element. It works perfectly. I am unable to do the same in angular. please see the below plunkers created in JS and Angular. In function move() method, by onclick I animated to move the text to some distance. To see animation Click on all texts in output in both plunkers. In JS plunker To animate the firstChild in onload, in line 38 I used

问题 I have a function that I wish to apply to a dataframe: def DetermineMid(data, ts): if data['U'] == 0 and data['D'] > 0: mid = data['C'] + ts / 2 elif data['U'] > 0 and data['D'] == 0: mid = data['C'] - ts / 2 else: diff = data['A'] - data['B'] if diff == 0: mid = data['C'] + 1 else: mid = data['C'] return mid My df columns are A, B, C, D, U. My call is as follows: df = df.apply(DetermineMid, args=(5, ), axis=1). On smaller dataframes this works just fine, but for this dataframe: DatetimeIndex

问题 I have a function that I wish to apply to a dataframe: def DetermineMid(data, ts): if data['U'] == 0 and data['D'] > 0: mid = data['C'] + ts / 2 elif data['U'] > 0 and data['D'] == 0: mid = data['C'] - ts / 2 else: diff = data['A'] - data['B'] if diff == 0: mid = data['C'] + 1 else: mid = data['C'] return mid My df columns are A, B, C, D, U. My call is as follows: df = df.apply(DetermineMid, args=(5, ), axis=1). On smaller dataframes this works just fine, but for this dataframe: DatetimeIndex

问题 This is basically the question asked here (not by me), but I've simplified the example and I simply can't figure out what is going on, so I decided I'd pose it again in a way that may get more responses. Take data dd : dd <- structure(list(first = c("118751", "55627", NA), one = c(41006L, 119098L, 109437L), two = c(118751L, 109016L, 109831L), three = c(122631L, 104639L, 120634L), four = c(38017L, 118950L, 105440L), five = c(114826L, 122047L, 124347L), six = c(109438L, 55627L, 118679L), seven

问题 Application has higher precedence than abstraction. In this sense, what is lambda calculus abstraction? I'm confused at what there is to have precedence over? 回答1: Lambda abstraction is λx.M , for some variable x and arbitrary term M . Application is (MN) , for some arbitrary terms M and N . Precdence is the question which of several operation is to be performed first if more than one reading is possible because the term is ambiguous due to ommission of brackets. For example in arithmetic,

问题 Application has higher precedence than abstraction. In this sense, what is lambda calculus abstraction? I'm confused at what there is to have precedence over? 回答1: Lambda abstraction is λx.M , for some variable x and arbitrary term M . Application is (MN) , for some arbitrary terms M and N . Precdence is the question which of several operation is to be performed first if more than one reading is possible because the term is ambiguous due to ommission of brackets. For example in arithmetic,