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PyQt based scientific calculator

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When I use graph + plot, after I finish the step: Enter the equation f(x):, for example: sin(x), then press the plot key. The programm exit without Error message immediately....

![help for matrix mode](https://user-images.githubusercontent.com/41500702/50482046-c73b1700-0a0a-11e9-9a59-b458ee86020e.gif)

_"Something that is untested is broken"_

backspace buttons behaves abnormally in complex mode and graph.

bug

Update the images

good first issue
easy

I want to add matrix capability to this application like: 1. The inverse of a matrix 2. multiplication of matrix 3. vector operation 4. visualization of vector fields

See https://pipenv.readthedocs.io/en/latest/

enhancement