DM.outputContains: Test whether variables are equal to pre-specified values and...

In jonathancornelissen/DM: Tools for the using the interactive www.DataMind.org learning platform

Description

Function checks whether the ouput of the argument expr can be found in the output of the student's console.

Usage

DM.outputContains( expr, console.output=DM.console.output )

Arguments

expr	The expression (as string) for which the output should be in the student's console.
console.output	The string containing the output printed to the student's console. By default this will be recorded in DM.console.output before the Submission Correctness Test starts, so the console.output argument here is by default also set to DM.console.output.

Value

TRUE when the student's console indeed contains the ouput you expect based on the given expression, FALSE otherwise.

Examples

# Suppose the student has to type a loop that print the numbers 1 upto 10
# Smart student does exactly that and types: 
DM.user.code = '
n<-10;
for(i in 1:n){print(i)};
'
# What student's console contains:
DM.console.output = paste(capture.output(eval(parse(text=DM.user.code))), collapse="")
# What the test tells us:
DM.outputContains("for(i in 1:10){print(i)}")
# Suppose the student was supposed to loop upto 20:
DM.outputContains("for(i in 1:20){print(i)}")

jonathancornelissen/DM documentation built on May 19, 2019, 7:27 p.m.