intervals

问题 Is there an example of a working timer that executes some function every x amount seconds using C. I'd appreciate an example working code. 回答1: You could spawn a new thread: void *threadproc(void *arg) { while(!done) { sleep(delay_in_seconds); call_function(); } return 0; } ... pthread_t tid; pthread_create(&tid, NULL, &threadproc, NULL); Or, you could set an alarm with alarm(2) or setitimer(2): void on_alarm(int signum) { call_function(); if(!done) alarm(delay_in_seconds); // Reschedule

问题 i have a sliding window problem. specifically, i do not know where my window should start and where it should end. i do know the size of my interval/window. i need to find the start/end of the window that delivers the best (or worst, depending on how you look at it) case scenario. here is an example dataset: value | tstamp 100 | 2013-02-20 00:01:00 200 | 2013-02-20 00:02:00 300 | 2013-02-20 00:03:00 400 | 2013-02-20 00:04:00 500 | 2013-02-20 00:05:00 600 | 2013-02-20 00:06:00 500 | 2013-02-20

问题 I have created a data structure consisting of intervals. The data structure should naturally have an enumerator that enumerates all intervals, but I would like to expose two different enumerators that enumerate the intervals in different order. One of the enumerators enumerate the intervals really fast, but in somewhat arbitrary order. The other enumerates them in lexicographical order, but a bit slower (depends on the intervals though). Depending on what you try to achieve, one enumerator

问题 I have a dataframe with the following structure - Start, End and Height. Some properties of the dataframe: A row in the dataframe always starts from where the previous row ended i.e. if the end for row n is 100 then the start of line n+1 is 101. The height of row n+1 is always different then the height in row n+1 (this is the reason the data is in different rows). I'd like to group the dataframe in a way that heights will be grouped in buckets of 5 longs i.e. the buckets are 0, 1-5, 6-10, 11

问题 I often find myself trying to create a categorical variable from a numerical variable + a user-provided set of ranges. For instance, say that I have a data.frame with a numeric variable df$V and would like to create a new variable df$VCAT such that: df$VCAT = 0 if df$V is equal to 0 df$VCAT = 1 if df$V is between 0 to 10 (i.e. (0,10)) df$VCAT = 2 is df$V is equal to 10 (i.e. [10,10]) df$VCAT = 3 is df$V is between 10 to 20 (i.e. (10,20)) df$VCAT = 4 is df$V is greater or equal to than 20 (i.e

问题 I often find myself trying to create a categorical variable from a numerical variable + a user-provided set of ranges. For instance, say that I have a data.frame with a numeric variable df$V and would like to create a new variable df$VCAT such that: df$VCAT = 0 if df$V is equal to 0 df$VCAT = 1 if df$V is between 0 to 10 (i.e. (0,10)) df$VCAT = 2 is df$V is equal to 10 (i.e. [10,10]) df$VCAT = 3 is df$V is between 10 to 20 (i.e. (10,20)) df$VCAT = 4 is df$V is greater or equal to than 20 (i.e

问题 Using SymPy, is it possible to limit the possible values of a symbol/variable to a certain range? I now I can set some properties while defining symbols, like positive=True , but I need more control, i.e. I need to set it to be in the interval [0,1]. This assumption should then be used for solving, simplifying etc. 回答1: You can specify the bounds as inequalities such as x >= lb and x <= ub , for example: from sympy.solvers import solve from sympy import Symbol x = Symbol('x') solve([x >= 0.5,

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed last year . I am looking for some python code to efficiently compute interval overlaps. I've used the interval tree of the bx-python package before, but now need to delete intervals from the tree (or better yet, modify them). It seems the bx-python tree doesn't support this. Any pointers? 回答1:

问题 I have got a TimePickerDialog working to set time which is set to a TextView in order to display it. Now, I need help to set that TimePicker (inside the TimePickerDialog) minutues interval to 15 minutes. I have seen there is a post with 15 minutes interval issue related to TimePicker, but I don't know how to apply it to the TimePickerDialog because I don't know how to use the TimePicker that it is created inside the TimePickerDialog. I am new to Android and completely lost in this matter.

问题 A library and webservice I am using communicates time-intervals in ISO 8601 format: PnYnMnDTnHnMnS. I want to convert such formats to seconds. And vice versa. Seconds are a lot easier to calculate with. Example interval values are: PT1M or PT60S (1 minute) PT1H, PT60M or PT3600S (1 hour) I need two functions: parse from such values to seconds: iso8601_interval_to_seconds() and from seconds into such intervals: iso8601_interval_from_seconds() . The latter is rather simple, because it could be