R count rows with multiple conditions

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Count rows if they meet conditions in two columns. I am new into R studio and I want to count the number of rows that meet conditions in two columns. let's say I have a dataset something like : df <- data.frame (stringsAsFactors = FALSE, A = c ("X", "Y", "X", "X", "Z"), B = c (0, 1, 0, 0, 1), C = c ("AD2758", "AD2758", "AD2764", "AD2768", "AD2772") )

Aug 04, 2020 · COUNT(*) AVG(SALARY) 2 33500. In this example, the aggregate function AVG is used in a SELECT statement that has a WHERE clause. Texis selects the rows that represent Marketing Department employees and then applies the aggregate function to these rows. You can divide the rows of a table into groups based on values in more than one column.

Hello, I'm working with R and have obtained a table which contains 3 columns and a row for each of my genes in an RNA-seq study. The first two columns contain fold conc and log fold change, respectively, but I'm most interested in the third column and finding how many of the genes have a p.value less than 0.05.
  • How to Sort Multiple Rows and Columns in Excel. With Microsoft Excel's powerful sorting capabilities, you can enter unsorted data and let the software sort your data numerically, alphabetically or ...
  • For an n th order system (i.e., it can be represented by an n th order differential equation) with r inputs and m outputs the size of each of the matrices is as follows: q is n x 1 (n rows by 1 column); q is called the state vector, it is a function of time
  • Dec 10, 2017 · The nested IF function is formed by multiple if statements within one Excel if function. This excel nested if statement makes it possible for a single formula to take multiple actions.The syntax of Nested IF function is as below:=IF(Condition_1,Value_if_True_1,IF(Condition_2,Value_if_True_2,Value_if_False_2))…. Excel IF function

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    =IF(OR("if this condition stated here is true", or "if this condition stated here is true”), then enter "this value", else enter "this value") Lets break this down into simple stages. You may have a spreadsheet that you want to use to work out whether or not a pupil should be entered for a higher Maths paper in their exams.

    Dec 09, 2014 · How to append one or more rows to non-empty data frame; For illustration purpose, we shall use a student data frame having following information: First.Name Age 1 Calvin 10 2 Chris 25 3 Raj 19 How to Append one or more rows to an Empty Data Frame. Following code represents how to create an empty data frame and append a row.

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    The value set specifies the percentage of the homogeneous subgroup defined by search_condition to be sampled for the report. No more than 16 samples can be requested per fraction description. count_description. a set of positive integer constants that specifies the number of rows to be sampled for a true search condition.

    The SQL COUNT function returns the number of rows in a query. NULL value will not be counted. SQL COUNT Syntax SELECT COUNT(expression) AS resultName FROM tableName WHERE conditions The expression can be *, column name or DISTINCT column name. All these 3 expressions work with MS SQL Server, Oracle and mySQL. SQL COUNT Examples. Table: Employees

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    Dec 10, 2017 · The nested IF function is formed by multiple if statements within one Excel if function. This excel nested if statement makes it possible for a single formula to take multiple actions.The syntax of Nested IF function is as below:=IF(Condition_1,Value_if_True_1,IF(Condition_2,Value_if_True_2,Value_if_False_2))…. Excel IF function

    Figure 4. Entering the formula to count visible rows only for Group A. With all rows displayed, the resulting count in F3 is 3, which corresponds to the three rows with Group A in rows 3,4 and 5. Now let us hide row 4 and count the visible rows for Group A. Figure 5. Counting only visible rows for Group A, excluding row 4. With row 4 hidden ...

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    Note: In the sp table, the qty column for one of the rows contains null. The comparison - qty >= 200, evaluates to unknown for this row. In the final result of a query, rows with a WHERE clause evaluating to unknown (or false) are eliminated (filtered out).

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    The following query demonstrates the use of ROW constructor to compare a row of values. It's normally used in a query where a subquery returns a row of values. Copy and paste the following SQL to your SQLyog free Community Edition query window. Note that the SQL needs to end with semi-colon if you have multiple queries in the query window.

    Feb 09, 2012 · Here you will see the normal use of INNER JOIN where a query returns the results as the number of rows or fewer than the number of rows in the table. This happens because the data is unique in both of the tables. Query 1: Inner Join with Equal to Sign-- Query 1 SELECT f.Col1 fCol1 FROM FirstTable f INNER JOIN SecondTable s ON s.Col1 = f.col1 GO

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    Sep 24, 2018 · Every day I spend a good amount of time with different customers helping them with SQL Server Performance Tuning issues. Today we will discuss the question asked by a developer at the organization where I was engaged in Comprehensive Database Performance Health Check. The developers wanted to know if there is any way he can randomly select n rows from a table.

    Jan 31, 2014 · In the first example we selected the first row. In the second example, we used a vector of indices (in this case 1 and 1), so it returned the first row twice, nice! Lets try something else. dt[c(1,2,2,3,3,3)] Output: fact count 1: a 1 2: b 2 3: b 2 4: c 3 5: c 3 6: c 3 There we go! We just expanded the original three row data set into six rows.

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    This dataset seems to have two problems. First, it has variables in the rows in the column element. Second, it has a variable d in the column header spread across multiple columns. Causes of Messiness. There are various features of messy data that one can observe in practice. Here are some of the more commonly observed patterns.

    In R Data Frames, data is stored in row and columns, and we can access the data frame elements using the row index and column index. The following are some of the characteristics of the R Data Frame: A data frame is a list of variables, and it must contain the same number of rows with unique row names.

Given a circle of radius R, the experiment is to randomly select a chord in that circle. There are many ways to accomplish such a selection. However the sample space is always the same: {AB: A and B are points on a given circle}. One natural random variable defined on this space is the length of the chord. Human height. The experiment is to ...
Jun 10, 2019 · 2.You can count the department count with count and group by statement but the question is to transpose it. We need to write PL SQL statement to transpose the values. So the much better way is to use pivot statement. SQL Pivot Multiple Columns : In this section we can check one example of SQL Pivot Multiple columns in details.
Dear All, I would like to select all rows of a dataset satisfying a certain condition (when the variable V1 = 0) AND also keep the observation/row preceding each of them. That is, given database db1 data db1; input id V1 V2; datalines; 1 2 2.1 1 0 2.9 1 2 3.1 2 4 ...
Rounds a number up to the nearest integer multiple of specified significance, with negative numbers rounding toward or away from 0 depending on the mode. Learn more. Math: CEILING.PRECISE: CEILING.PRECISE(number, [significance]) Rounds a number up to the nearest integer multiple of specified significance.