Exam (elaborations)
MGG Exam 8 oct . 19/35 Questions and Answers A+ Rated
MGG Exam 8 oct . 19/35 Questions and Answers A+ Rated
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MGG Exam 8 oct . 19/35 Questionsand Answers A+ Rated
what does a conditional statement set - - first sets a condition, then a
consequent action
-condition
-action
-other
if(condition){
action statement
}else{
second action statement
}
- curly braces surround - - each action statement
- example of conditional statement with Bactcount - - 1. set up empty
vector to hold inputted values that conditional statement feeds
BactCount <- c()
2. load sample
Sample<- 110
if (Sample>50){
BactCount <- append(BactCount, Sample)
}else{
BactCount <- append(BactCount, 0)
}
BactCount
[1] 110
If sample was less than 50, would have added zero
- How do you test for more than one condition? - - use
else if
how do you show greater than or Equal to?
else if (120<=systolicData & systolicData < 130)
, this is asked if the number is greater than or equal to 120 AND less than 130
what do you use at the end of conditional statements
else
(for all other data that doesn't fit any of the other parameters)
- What does a For Loop allow you to do? - - lets you perform an action on
every element in your vector. You do this "interactively" or element by
element
you assign the element to a temporary variable and then use this variable in
the action statement
- how do you format a for loop? - - vector1 <- c(1,2,3,4,5)
for (i in vector1){
a<- 2*i
print(a)
}
prints all the numbers where the value was multiplied by 2 for each value in
the vector
-can do the same thing w BactCount example, only difference is load all
values into Samples
and then code is
for ( i in samples){
if .....
- what is a function? - - a function is a block of code that you can apply with
a single word no matter how long it is
example is R function "sum"
- How do you create your own functions? - - FunctionName <-
function(argument1, argument2, etc.){
block of code
}
block of code- usually something like
print(argument1/argument2)
this would be for the divide function since the arguments are dividing
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