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The problem seems to be that the grid method doesn't return anything, so StarterQuantity gets assigned None i.e. the default return value for a function.

We can create the Surv object as

Don't try to do your animation in draw(rect:). That puts all the work on the CPU, not the GPU, and does not take advantage of the hardware-accelerated animation in iOS.

I would suggest instead using a CAShapeLayer and a CABasicAnimation to animate your path.

Install the CGPath from your UIBezierPath into the CAShapeLayer, and then create a CABasicAnimation that changes the path property of the shape layer.

The trick to getting smooth shape animations is to have the same number of control points for every step in the animation. Thus you should not add more and more points to your path, but rather create a new path that contains a graph of the last n points of your waveform.

I would suggest keeping a ring buffer of the n points you want to graph, and building a GCPath/UIBezierPath out of that ring buffer. As you add more points, the older points would "age out" of the ring buffer and you'd always graph the same number of points.

Ok, you need something simpler than a ring buffer: Let's call it a lastNElementsBuffer. It should let you add items, discarding the oldest element, and then always return the most recent elements added.

Here is a simple implementation:

I modified your code: I removed the unnecessary int casts from the program.

Please try it:

I think I got what you want using ggplot2. The idea is to pick elements from your brier object that contains data for the plot, make a dataframe with it and plot it.

Your code has some problems:

1. It's usually better to use the optional ? operator and don't force the cast with !! to avoid a crash by NullPointerException
2. You need to initialize your views in the onCreateView method by referring to the view instance.
   Unlike activities, fragments don't call the setContentView method, so you can't refer directly to the layout items.

In my code I used the inline method setOnClickListener and I assumed that start and stop are Buttons, if it's not the case you just need to change the type of the two views in their declaration.

Try to change your fragment's code like this:

I have ported the MATLAB code to estimate Johnson distributions parameters from moments

https://www.mathworks.com/matlabcentral/fileexchange/46123-johnson-curve-toolbox

to Python

https://github.com/maxdevblock/j_johnson_M

Usage

It's expecting "2-tuple of array_like, optional" so that looks like:

Your issue is on the final line, you typed emd instead of emb.