The data verb functions all take a data frame as their first argument and return a data frame as their output. The chaining syntax lets the output of one function become the input to the following function, so you do not have to repeat the name of the data frame. An alternative syntax is to assign the output of one function to a named object, then use the object as the first argument to the next function in the computation. Each of the following statements, EXCEPT one, will accomplish the same calculation. Identify the statement that does NOT match the others. a. BabyNames %>% group_by year, sex ) %>% summarise( totalBirths=sum(count))
b. group_by( BabyNames, year, sex) %>% summarise( totalBirths=sum (count))
c. group_by( BabyNames, year, sex ) %>% summarise( totalBirths=mean(count))
d. Tmp <- group_by (BabyNames, year, sex) summarise( Tmp, totalBirths=sum(count))

Write a program that defines symbolic names for several string literals (chars between quotes). * use each symbolic name in a variable definition. * use of symbolic to compose the assembly code instruction set can perform vara = (vara - varb) + (varc - vard); ensure that variable is in unsigned integer data type. * you should also further enhance your symbolic logic block to to perform expression by introducing addition substitution rule. vara = (vara+varb) - (varc+vard). required: debug the disassembly code and note down the address and memory information.

Write a function balancechemical to balance chemical reactions by solving a linear set of equations. the inputs arguments are: reagents: symbols of reagents in string row array products: symbols of products in string row array elements: elements in the reaction in string row array elcmpreag: elemental composition of reactants in two dimensional numeric array elcmpprdcts: elemental composition of prducts in two dimensional numeric array hint: the first part of the problem is setting up the set of linear equations that should be solve. the second part of the problem is to find the integers from the solution. one way to do this is to mulitiply the rational basis for the nullspace by increasing larger integers until both the left-and right-side integers exist. for example, for the reaction that involves reacting with to produce and : reagents=["ch4", "o2"]; products =["co2", "h2o"]; elements =["c","h", "o"] elcmpreag=[1,4,0;

Which option correctly describes a dbms application? a. software used to manage databases b. software used to organize files and folders c. software used to develop specialized images d. software used to create effective presentations