average

Why do I see no computed results in my output file?

由 南楼画角 提交于 2019-12-04 05:49:14
问题 This is a follow-up to How do I average column values from a tab-separated data file, ignoring a header row and the left column?. The task was: open and read a file; reach each line, split the contents into an array, and compute the average of the numerical values; and finally to write to a new file the averages for each of the columns containing numerical values. All seems to be well up until the final point. The problem is, though I can create a new .txt file, the .txt file itself doesn't

How to find average intensity of OpenCV contour in realtime

由 僤鯓⒐⒋嵵緔 提交于 2019-12-04 05:19:23
I have a image with about 50 to 100 small contours. I wish to find the average intensity[1] of each of these contours in real-time[2]. Some of the ways I could think of was Draw contour with FILLED option for each contour; use each image as a mask over the original image, thus find the average. But I presume that this method won't be real-time at first glance. Study OpenCV implementation of drawContour function with the FILLED option and access the pixels enclosed by the contour in the same manner. But the code seems really complex and not readily understandable. Calculate the minimum area

even and odd averages using array

由 落花浮王杯 提交于 2019-12-04 05:18:23
问题 Write a program that reads a list of 10 values from the user. Put the values in an array. The program should read the array and then calculate and display the average of the even input values and the average of the odd input values. This should be done using objects, methods, and a tester class. I cannot figure out why I am receiving the error: bad operand types for binary operator. I do not know what to change. I know something is wrong with my mod (%). Here is what I have so far for my

Get `n` random values between 2 numbers having average `x`

由 纵然是瞬间 提交于 2019-12-04 05:12:17
问题 I want to get n random numbers(e.g n=16)(whole numbers) between 1 to 5(including both) so that average is x. x can be any value between (1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5). I am using PHP. e.g. Suppose I have average x= 3. Then required 16 whole numbers between 1 to 5(including both). like (1,5,3,3,3,3,2,4,2,4,1,5,1,5,3,3) Update: if x=3.5 means average of 16 numbers should be between 3.5 to 4. and if x=4 means average of 16 numbers should be between 4 to 4.5 and if x=5 means all numbers are

Finding the average of an array using c [closed]

由 不羁岁月 提交于 2019-12-04 04:29:42
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . I am new to coding in C and I am trying to get the average of the array but for some reason it is not calculating, it is giving me a result of 0.0. How can I fix this. Thanks #include <stdio.h> float grades_average(float grades[7]); int main() { float grades[7]={98.8, 97.9, 99.3, 99.8, 99.6, 99.4, 99.9}; float

Take the average of two signed numbers in C

由 拜拜、爱过 提交于 2019-12-04 01:21:16
Let us say we have x and y and both are signed integers in C, how do we find the most accurate mean value between the two? I would prefer a solution that does not take advantage of any machine/compiler/toolchain specific workings. The best I have come up with is: (a / 2) + (b / 2) + !!(a % 2) * !!(b %2) Is there a solution that is more accurate? Faster? Simpler? What if we know if one is larger than the other a priori? Thanks. D Editor's Note : Please note that the OP expects answers that are not subject to integer overflow when input values are close to the maximum absolute bounds of the C

sql - find average salary for each department with more than five members

由 ＊爱你＆永不变心＊ 提交于 2019-12-03 21:58:11
Not quite sure how to get this one. I have a staff table and I need to find the average salary. I know I can use use avg() . But the trick is I need to find the average for departments that have more than 5 staff members. I'm not sure if I should use group by or how to use it. Thanks! CREATE TABLE STAFF (STAFF_ID CHAR(3), STAFF_NAME CHAR(20), GENDER CHAR(6), DEPARTMENT CHAR(20), BOSS_ID CHAR(3) SALARY NUMBER(8,2)); Vikram select DEPARTMENT,count(STAFF_ID) as CountStaff, avg(SALARY) as AVGSalary from STAFF group by DEPARTMENT having count(STAFF_ID) > 5 来源： https://stackoverflow.com/questions

Average stock history table

由 北慕城南 提交于 2019-12-03 20:25:45
问题 I have a table that tracks changes in stocks through time for some stores and products. The value is the absolute stock, but we only insert a new row when a change in stock occurs. This design was to keep the table small, because it is expected to grow rapidly. This is an example schema and some test data: CREATE TABLE stocks ( id serial NOT NULL, store_id integer NOT NULL, product_id integer NOT NULL, date date NOT NULL, value integer NOT NULL, CONSTRAINT stocks_pkey PRIMARY KEY (id),

Summarize array of objects and calculate average value for each unique object name

由 五迷三道 提交于 2019-12-03 16:29:05
I have an array like so: var array = [ { name: "a", value: 1 }, { name: "a", value: 2 }, { name: "a", value: 3 }, { name: "b", value: 0 }, { name: "b", value: 1 } ]; And I need an array like this: var newarray = [ { name: "a", value: 2 }, { name: "b", value: 0.5 } ] Where the new array has each unique name as an object with the average value. Is there an easy way to accomplish this? You'll have to loop through the array, computing the sum and counts for each object. Here's a quick implementation: function average(arr) { var sums = {}, counts = {}, results = [], name; for (var i = 0; i < arr

Moving average in postgresql

由 别来无恙 提交于 2019-12-03 16:06:57
问题 I have the following table in my Postgresql 9.1 database: select * from ro; date | shop_id | amount -----------+----------+-------- 2013-02-07 | 1001 | 3 2013-01-31 | 1001 | 2 2013-01-24 | 1001 | 1 2013-01-17 | 1001 | 5 2013-02-10 | 1001 | 10 2013-02-03 | 1001 | 4 2012-12-27 | 1001 | 6 2012-12-20 | 1001 | 8 2012-12-13 | 1001 | 4 2012-12-06 | 1001 | 3 2012-10-29 | 1001 | 3 I am trying to get a moving average comparing data against last 3 Thursdays without including the current Thursday. Here's
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