Error in Swirl Lesson 3 (swirlExpectation)

swirldev / swirl_courses

:mortar_board: A collection of interactive courses for the swirl R package.

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Error in Swirl Lesson 3 (swirlExpectation) #340

Closed FlixMarc closed 8 years ago

FlixMarc commented 8 years ago

Hey there,

I have a problem in Swirl level 3 - now matter how I answer the question "What do you think tf will look like" the program leaves swirl with an [error in swirlExpectations (condition(object)) : could not find function "is_equivalent_to"]. Does anyone have the same problem and can help me with that? Thanks in advance!

MiloudEloumri commented 8 years ago

I have the same problem.

MiloudEloumri commented 8 years ago

After Googling a bit,
I believe the "is_equivalent_to" is part of testthat package
So, you may need to install it using: install.packages("testthat")
# But it shows problems in the installation of testthat package
Also, if you install the testthat package, the swirl package will fail! and you will need to install the swirl package again.
If you do install swirl again, you will lose your learning history progress stored in your current working directory in .Rhostry or .Rdata file.

- So, it might not be the solution you go for.

seankross commented 8 years ago

@MiloudEloumri answer is correct. Thanks.

MattJones76 commented 7 years ago

Same issue, solution isn't working for me. I'm still receiving the same prompt after installing the testthat package, and reinstalling the swirl package.

` Error in testthat_expectation$passed : $ operator is invalid for atomic vectors

| Leaving swirl now. Type swirl() to resume. `

MattJones76 commented 7 years ago

Here's a different solution: https://github.com/swirldev/swirl_courses/issues/339

Worked for me. Thanks.