Release v1.3.0 Heaviside · Zushah/Chalkboard

The fourth release of the Chalkboard library, version 1.3.0. Main updates include:

Lots of exciting new calc commands, including but not limited to: multivariable explicit functions, vector fields, 3D parametric curves and surfaces, second-order differentiation, partial differentiation, gradient, divergence, curl, double integration, arc length, surface area, and line/surface integration
A new example which shows off the new vector field functionalities
Several new and updated vector commands regarding conversions between coordinate systems (polar, cylindrical, spherical, etc.), conversions between matrices and vectors (specifiable rows/columns in matr.toVector), and vector projections/rejections
All plot commands can now optionally have their opacity changed (with the rgba parameter, which used to only be rgb)
The func.type value for parametric functions has been changed from "para" to either "curv" (for parametric curves) or "surf" (for parametric surfaces)

Thanks to @bhavjitChauhan for his contribution to this update regarding a bugfix with the matr.invert command.

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