max

问题 This is what I have and it keeps returning null. It doesn't recognize the Convert.toInt32 when I add a where statement var maxTopID = (from max in dbcontext.Topics.Local select max.TopicID).Max(); 回答1: How about converting the TopicID in SELECT and use String.IsNullOrEmpty() to remove empty string, like: var maxTopID = (from max in dbcontext.Topics.Local where !String.IsNullOrEmpty(max.TopicID) select Convert.ToInt32(max.TopicID)).Max(); See the Demo 回答2: I think you are saying that TopicID

问题 This is what I have and it keeps returning null. It doesn't recognize the Convert.toInt32 when I add a where statement var maxTopID = (from max in dbcontext.Topics.Local select max.TopicID).Max(); 回答1: How about converting the TopicID in SELECT and use String.IsNullOrEmpty() to remove empty string, like: var maxTopID = (from max in dbcontext.Topics.Local where !String.IsNullOrEmpty(max.TopicID) select Convert.ToInt32(max.TopicID)).Max(); See the Demo 回答2: I think you are saying that TopicID

问题 I would like to obtain the n-th minimum or the n-th maximum value from numerical columns in the DataFrame in pandas. Example: df = pd.DataFrame({'a': [3.0, 2.0, 4.0, 1.0],'b': [1.0, 4.0 , 2.0, 3.0]}) a b 0 3.0 1.0 1 2.0 4.0 2 4.0 2.0 3 1.0 3.0 The third largest value in column a is 2 and the second smallest value in column b is also 2. 回答1: You can use nlargest / nsmallest - df a b 0 3.0 1.0 1 2.0 4.0 2 4.0 2.0 3 1.0 3.0 df.a.nlargest(3).iloc[-1] 2.0 Or, df.a.nlargest(3).iloc[[-1]] 1 2.0 Name

问题 Is there any way to find maximum value of 3 different columns? I'm trying to find records with any of 3 columns value higher than specified value and trying to avoid making something like this in query: column1 > 69 or column2 > 69 or column3 > 69 Table structure is like this: id | column1 | column2 | column3 1 | 5 | 4 | 3 2 | 70 | 1 | 65 3 | 66 | 3 | 90 And select like this: select id from tablex where column1 > 69 or column2 > 69 or column3 > 69 -- but with better query, a bit prettier like

问题 I want to create an array which holds all the max() es of a window moving through a given numpy array. I'm sorry if this sounds confusing. I'll give an example. Input: [ 6,4,8,7,1,4,3,5,7,2,4,6,2,1,3,5,6,3,4,7,1,9,4,3,2 ] My output with a window width of 5 shall be this: [ 8,8,8,7,7,7,7,7,7,6,6,6,6,6,6,7,7,9,9,9,9 ] Each number shall be the max of a subarray of width 5 of the input array: [ 6,4,8,7,1,4,3,5,7,2,4,6,2,1,3,5,6,3,4,7,1,9,4,3,2 ] \ / \ / \ / \ / \ / \ / \ / \ / [ 8,8,8,7,7,7,7,7,7

问题 I was wondering if anyone could help me find the maximum value of a set of variables and assign them to another variable. Here is a snippet of my code that may help with understanding what I am talking about. // Ask for quarter values. System.out.println("What is the value of the first quarter?"); firstQuarter = input.nextDouble(); System.out.println("What is the value of the second quarter?"); secondQuarter = input.nextDouble(); System.out.println("What is the value of the third quarter?");

问题 I am interested in working with BLE proximity sensor on iOS and have been looking up for a few answers to my query but could not find any solid ones. 1) Is there a maximum number of BLE slaves the CoreBluetooth can handle? 2) Will the slaves (about 10 devices) be able to be operated all at once i.e. if any slaves were to disconnect, master will be alerted while not affecting others? 回答1: Theoretically, there is no limit to the number of Bluetooth LE devices that can be connected to a single

问题 I have a data.frame with columns "a" and "b". I want to add columns called "high" and "low" that contain the highest and the lowest among columns a and b. Is there a way of doing this without looping over the lines in the dataframe? edit: this is for OHLC data, and so the high and low column should contain the highest and lowest element between a and b on the same line, and not among the whole columns. sorry if this is badly worded. 回答1: Sounds like you're looking for pmax and pmin ("parallel

问题 I think the maximum integer in python is available by calling sys.maxint . What is the maximum float or long in Python? 回答1: For float have a look at sys.float_info: >>> import sys >>> sys.float_info sys.floatinfo(max=1.7976931348623157e+308, max_exp=1024, max_10_exp=308, min=2.2 250738585072014e-308, min_exp=-1021, min_10_exp=-307, dig=15, mant_dig=53, epsil on=2.2204460492503131e-16, radix=2, rounds=1) Specifically, sys.float_info.max : >>> sys.float_info.max 1.7976931348623157e+308 If that

问题 Is there a method to swap the maximum and the minimum of a list? The list will be as follows and the program has to be continued so that it will print the maximum swapped with the minimum, the second maximum swapped with the second minimum and third maximum swapped with the third minimum. Eg. Enter input- 0 1 2 3 4 5 6 7 8 9 -1 Output- 9873456210 a = [] nums = raw_input("Enter input- ") for n in nums.split(): n = int(n) if n < 0: break a.append(n) if len(a)<7: print "please enter more than 7