double

问题 Here is request for mysql database. "UPDATE client_storrage SET LastMatched =UTC_TIMESTAMP() WHERE XUID =01100000000000" It gives error Truncated incorrect DOUBLE value: '01100000000000' XUID varchar(20) utf8_bin LastMatched datetime Can any one help to fix this ? 回答1: if XUID is a varchar you have to use quotes around it in your query: UPDATE client_storrage SET LastMatched = UTC_TIMESTAMP() WHERE XUID = '01100000000000' 来源： https://stackoverflow.com/questions/8943834/mysql-truncated

问题 I am currently writing a program that will read through a designated text file that checks the transaction values of each buy/sell/summary and checks the arithmetic such that if the transactions from the buy and sell statements do not equal the total transaction amount that was given in the summary then it outputs an error and closes the program. But currently my method scanMoneyValue has an error that says it's not returning a double, when in fact it is. Is there a different way I should go

问题 Doing function that takes 2 arrays (column1 and column2) from struct CSV D and plots the graph from it. Idea is to find max, min values of each array, then break range between min−EPSILON and max+EPSILON in to 600 equal regions, where EPSILON = 10^(−6) Problem is that function does not plot the lowest line properly, I think the issue is when comparing the value from array with min-EPSILON , not sure. Please advice. Here's my code. void do_plot(CSV *D, int column1, int column2) { #define Y

问题 Doing function that takes 2 arrays (column1 and column2) from struct CSV D and plots the graph from it. Idea is to find max, min values of each array, then break range between min−EPSILON and max+EPSILON in to 600 equal regions, where EPSILON = 10^(−6) Problem is that function does not plot the lowest line properly, I think the issue is when comparing the value from array with min-EPSILON , not sure. Please advice. Here's my code. void do_plot(CSV *D, int column1, int column2) { #define Y

问题 I have two variables who look exactly the same to me, but one is <double> and the other is <cell> . In the code it seems that they are converted by cell2mat . I understand it is a question of data storage but I just don't see the difference and the definition of cell and double for this. 回答1: Adding to nrz's answer, it is noteworthy that there is an additional memory overhead when storing cell arrays. For instance, consider the following code: A = 1:5 B = {A} C = num2cell(A) whos which

问题 I have a function in my code like (C#, NET 3.5, Visual Studio 2008): public double function CalculateSomething() { ... double a = double.NaN; // Or double.MaxValue, with same behaviour ... } This function is called by the main class, like this: ... double res = o.CalculateSomething(); ... Although it looks like incredible (for me, it is) and ONLY on certain computers (only in 2 computers from 60) without anything special (WinXP SP3), if I use the "alias" (double.NaN or double.MaxValue) the

问题 i cannot get my List> to double[][] to work on linear algebra package like JAMA. Basically i have some sort of List with coordinates like this : [[2.63, 11.087, -12.054], [2.357, 13.026, -15.29], [1.365, 16.691, -15.389], [0.262, 18.241, -18.694]] And i am trying to put these coordinates to JAMA class which is double[][]. I tried to use method toArray, but i failed. double[][] array = list.toArray(new double[list.size()][]); How to do that? Or is there other packages to cope with SVD, which i

问题 My question is a bit theoretical but actually I need it in practice. Let's assume that we have two double variables X and Y . Y is certain next double number of X (as you already know we can't keep any real number in double because real number are infinite even in 0 to 1 interval). Does (Y - X) is constant? And if yes what is it's value? P.S. My question is related to Microsoft.NET Framework. 回答1: The minimum difference between two double values in .NET is Double.Epsilon. As for comparing

问题 This question relates to: r - reorder second vector according to first. The solution there does not solve the problem when vectors don't start from 1 and have class double . Given the following two vectors: a <- c(5.1, 7.2, 4.3, 8.4) b <- c(4.3, 7.2, 8.4, 5.1) a third vector c needs be created that would give the order in which vector b needs be reordered for it to be in the same order as a . In this case: c <- c(4, 2, 1, 3) such that: > b[c] == a [1] TRUE TRUE TRUE TRUE 回答1: Isn't this c <-

问题 I have a question about intent in android application i have an array in class1 double [][] tableCityPair = new double[100][100]; ---here code to fill array--- in the end of class i want to send tableCityPair to another class, class2 . how i should declare for array in class2 ? is this right? Intent it = getIntent(); double tabelJarakAntarKota= it.getDoubleExtra("tableCityPair",3); 回答1: The Bundle class has methods for passing and retrieving an array of double s: void putDoubleArray(String,