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I have a list of stock tickers which I've scraped from the web and I'm trying to remove 'n/a' values from.

Here's a snippet of what the list looks like before trying to remove the values:

What I'm trying to do in my endpoint, is:

1. Make an API call, which returns a JSON
2. for each item: search in our database for it
3. If it's found, skip it.
4. If it's not found, push it in an array "Response"

This is my code:

I can't Find a good Solution For this. Even I Don't Know Anything About taking BackUp And Restore BackUp File in Room DataBase. Please Help Me How to Do it.

I Don"t Have Any Longer Question But Stack OverFlow Giving me Error That's why I wrote this Line

I found Way to take Back up But I Can't found the solution for restore database when I check app shows restore success but in real data not available in app

I've been struggling with this little project for a while and I'd really appreciate your help.

I'm trying to build a genetic algorithm for drawing pictures using transparent shapes (triangles), something like this: https://chriscummins.cc/s/genetics/, but I've tried a lot of different hyperparameters and different techniques and I can't really get any convergence like the website above does. Sometimes it'll run for a long time and it'll still get stuck in stuff like the image below, which seems like it's converged to something, since there are not many different individuals, but it's not quite there!

The algorithm works basically likes this:

• Every individual in the population is a Painting on a empty/black canvas of a fixed number of triangles.
• Fitness of an individual is calculated by doing a pixel-wise Mean Absolute Error between an individual's painting and the target image.
• I use tournament selection to select which individuals can be chosen to breed to produce the next generation's individuals.
• Crossover between two paintings is basically randomly selecting half of each parent's genes, which is their triangles.
• The mutation consists of basically applying some change to the vertices' coordinates of each triangle in the painting.
• I apply mutations to the children generation.
• The best of each generation always automatically advances to the next generation. (Elitism)

I'll attach code below, hope it's understandable, tried to document it to make it easier for people to help me out.

Here is my Triangle (Gene) class:

When I try to print the variables indA, indB or string it seems to work. Two letters and a word are inputted, and if the letters are present in the word, the characters between the two letters are printed.

I am using JUnit 5 and want to test my business logic that is using Spring Data JPA. I am receiving errors with starting JPA test.

I have my properties:

I am reviewing some MATLAB code that is publicly available at the following location: https://github.com/mattools/matGeom/blob/master/matGeom/geom2d/orientedBox.m

This is an implementation of the rotating calipers algorithm on the convex hull of a set of points in order to compute an oriented bounding box. My review was to understand intuitively how the algorithm works however I seek clarification on certain lines within the file which I am confused on.

On line 44: hull = bsxfun(@minus, hull, center);. This appears to translate all the points within the convex hull set so the calculated centroid is at (0,0). Is there any particular reason why this is performed? My only guess would be that it allows straightforward rotational transforms later on in the code, as rotating about the real origin would cause significant problems.

On line 71 and 74: indA2 = mod(indA, nV) + 1; , indB2 = mod(indB, nV) + 1;. Is this a trick in order to prevent the access index going out of bounds? My guess is to prevent out of bounds access, it will roll the index over upon reaching the end.

On line 125: y2 = - x * sit + y * cot;. This is the correct transformation as the code behaves properly, but I am not sure why this is actually used and different from the other rotational transforms done later and also prior (with the calls to rotateVector). My best guess is that I am simply not visualizing what rotation needs to be done in my head correctly.

Side note: The external function calls vectorAngle, rotateVector, createLine, and distancePointLine can all be found under the same repository, in files named after the function name (as per MATLAB standard). They are relatively uninteresting and do what you would expect aside from the fact that there is normalization of vector angles going on.

How do I remove time from a date in PHP, for example:

20170803173418 I want to take 4 minutes and 13 seconds away and get the new datestamp that would be 20170803173005

What code do I use to get this?

EDIT

I currently have:

When I trying to do this