When the compiler compiles the class User and gets to the MyMessageBox line, MyMessageBox has not yet been defined. The compiler has no idea MyMessageBox exists, so cannot understand the meaning of your class member. You need to make sure MyMessageBox is defined before you use it as a member. This is solved by reversing the definition order. However, you have a cyclic dependency: if you move MyMessageBox above User, … Read more
Direct Answer In the code here: change sourceCode.split to sourceCode.split(). If you want to know more about this error, read below: When debugging, you’d better remove the try…except block, especially an “expect Exception” block, which is so generic that you will get lost about what is going wrong. When removed the try…except block and run these code again, … Read more
I recently saw this in an answer that was posted for me: What is typedef enum and why should we use it? I googled and found the following: http://www.programiz.com/c-programming/c-enumeration Right now it sounds slightly too technical for me so I dont think I understand what is going on or why one would use that. Bonus (optional): … Read more
The column went_on_backorder is a factor. Linear regression requires a numeric response variable. To use logistic regression, use glm in base R or a package such as vgam. Here’s a brief example: And you can predict your classes:
As is, you must delete the row out of the advertisers table before you can delete the row in the jobs table that it references. This: …is actually the opposite to what it should be. As it is, it means that you’d have to have a record in the jobs table before the advertisers. So … Read more
I have four different files named: main.py, vector.py, entity.py and physics.py. I will not post all the code, just the imports, because I think that’s where the error is (If you want, I can post more). main.py: entity.py: vector.py: physics.py: I then run from main.py and I get the following error: I’m guessing that the error is due to importing entity twice, … Read more
Can you make sure that you are calling these statements from the “main” thread outside of a delayed asynchronous callback (for example inside the onCreate() method). As soon as I call the same statements from a “delayed” method. In my case a ResultCallback, I get the same message. In my Fragment, calling the code below from inside a ResultCallback method produces … Read more
The error is because of the declaration: The vector contains pointers to mutable ships, but the code passes a pointer to a const ship to push_back. You either need to store const pointers in the vector: Or pass a non const pointer to the push_back: Side note: move the above function to a cpp, move it … Read more
It happens because R coerces last_visit[,2] to a dimensionless vector, whereas apply expects the object to have some dimensions. You can prevent the coercion by adding drop=F to your command, i.e.: Another way would be just to use lapply or sapply on the vector:
I have a small DataFrame that I want to plot using pandas. I am still trying to learn plotting from within pandas . I want a plot In the above example when I say . I get the strangest error. While I understand that the DataFrame with its very lopsided values makes a very un-interesting … Read more