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  1. Asked: May 17, 2022In: r

    Solving the error: error in lm.fit(x, y, offset = offset, singular.ok = singular.ok, …) : 0 (non-na) cases

    dttutoria Expert
    Added an answer on June 4, 2022 at 8:01 am

    The cause: Because variables x or y or both x and y have  only NAs, the lm(y x) command appears as an error. Solution: Before your lm commands, for example: I recommend testing if one of the variables contains all NAs: all(is.na(x)) all(is.na(y)) all(is.na(y^trans)) For instance: all(is.na(y)) [1] TRead more

    The cause: Because variables x or y or both x and y have  only NAs, the lm(y x) command appears as an error.

    Solution:

    Before your lm commands, for example:

    I recommend testing if one of the variables contains all NAs:

    all(is.na(x))
    all(is.na(y))
    all(is.na(y^trans))

    For instance:

    all(is.na(y))
    [1] TRUE
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  2. Asked: May 17, 2022In: r

    Error in .call.graphics(c_palette2, .call(c_palette2, null)): invalid graphics state – simple way to solve it

    dttutoria Expert
    Added an answer on June 3, 2022 at 4:58 pm

    The cause: The error invalid graphics state occurs as the present plot window is too small to satisfy the requirements of the displayed plot. Solution: You should expand the plot window by deleting all the plots in the console to create a large plot area. Then, the graphics state will not be reporteRead more

    The cause: The error invalid graphics state occurs as the present plot window is too small to satisfy the requirements of the displayed plot.

    Solution: You should expand the plot window by deleting all the plots in the console to create a large plot area. Then, the graphics state will not be reported error anymore.

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  3. Asked: May 17, 2022In: python

    Solving the error: error executing jupyter command ‘notebook’: [errno 2] no such file or directory

    dttutoria Expert
    Added an answer on June 3, 2022 at 3:58 pm

    The cause: The problem that the file or directory is not found can be caused by running pip install "ipython[notebook]". Because it muddles everything. Solution: To solve the problem, you should reinstall from PyPi and run like this: # For Python 2 pip install --upgrade --force-reinstall --no-cache-Read more

    The cause: The problem that the file or directory is not found can be caused by running pip install "ipython[notebook]". Because it muddles everything.

    Solution: To solve the problem, you should reinstall from PyPi and run like this:

    # For Python 2
    pip install --upgrade --force-reinstall --no-cache-dir jupyter
    # For Python 3
    pip3 install --upgrade --force-reinstall --no-cache-dir jupyter
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  4. Asked: May 17, 2022In: r

    The dim(x) must have a positive length error: what should you do?

    dttutoria Expert
    Added an answer on June 3, 2022 at 12:05 pm
    This answer was edited.

    The cause: The error appears because R coerces last_visit[,2] to a dimensionless vector, whereas apply needs to have some dimensions of the object. Solution: You can stop the compulsion by adding drop=F to the command: apply(last_visit[,2,drop=F], 1, best_recom) Or on the vector, you use lapply or sRead more

    The cause: The error appears because R coerces last_visit[,2] to a dimensionless vector, whereas apply needs to have some dimensions of the object.

    Solution: You can stop the compulsion by adding drop=F to the command:

    apply(last_visit[,2,drop=F], 1, best_recom)

    Or on the vector, you use lapply or sapply like this:

    lapply(last_visit[,2], best_recom)
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  5. Asked: May 12, 2022In: Programs

    What is the number of order lines?

    dttutoria Expert
    Added an answer on June 3, 2022 at 11:11 am

    The cause: This is called the "order line".  It usually involves a "Purchase Order" consisting of many lines or one line. Solution:  It is usually stored as the following example: (This is a [ORDERS] table with one row and a [Order-Lines] table with three rows which point towards the parent row.) [ORead more

    The cause: This is called the “order line”.  It usually involves a “Purchase Order” consisting of many lines or one line.

    Solution: 

    It is usually stored as the following example:

    (This is a [ORDERS] table with one row and a [Order-Lines] table with three rows which point towards the parent row.)

    [ORDERS] Table:

    OrderID:        14028
    Customer:       May Weller
    OrderDate:      14-FEB-2011
    

    [OrderLines] Table:

    OrderLineID: 223011 223012 223013
    OrderID:     14028 14028 14028
    quantity:    1 4 1
    Product:     Hose, 50ft Sprinkler Gum
    Price:       21.99 33.78 1.10
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