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Persistent invalid graphics state error when using ggplot2

I believe my dataframe is okay and my code is okay. In fact, I have eliminated parts of the dataframe and most of the graphing code to make things as basic as possible. But still, I get: ...
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Should a retrieval method return 'null' or throw an exception when it can't produce the return value

I am using java language,I have a method that is supposed to return an object if it is found. 36 Answers ...
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How do you use “

... scoping in the R intro , and am very curious about the <<- assignment. 6 Answers ...
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Using jQuery To Get Size of Viewport

...ewport, and to redetect this if the page is resized? I need to make an IFRAME size into this space (coming in a little on each margin). ...
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How to get a file or blob from an object URL?

I am allowing the user to load images into a page via drag&drop and other methods. When an image is dropped, I'm using URL.createObjectURL to convert to an object URL to display the image. I am not revoking the url, as I do reuse it. ...
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Haskell composition (.) vs F#'s pipe forward operator (|>)

...there a language reason that pipe-forward isn't used in Haskell or is it something else? 10 Answers ...
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SQLite Reset Primary Key Field

... tables in SQLite and I am trying to figure out how to reset the auto-incremented database field. 4 Answers ...
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How to get the class of the clicked element?

I can't figure it out how to get the class value of the clicked element. 6 Answers 6...
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How do I properly force a Git push?

...et up a remote non-bare "main" repo and cloned it to my computer. I made some local changes, updated my local repository, and pushed the changes back to my remote repo. Things were fine up to that point. ...
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'dragleave' of parent element fires when dragging over children elements

...e dragenter and dragleave events to the <div id="dropzone"> element. 22 Answers ...