This is a tool that you can use to calculate the divergence, gradient and curl of electromagnetic fields. You can find examples of how to use it here: http://behindthesciences.com/gradient-divergence-and-curl/
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Behind The Sciences (2020). Divergence, gradient and curl computation (https://www.mathworks.com/matlabcentral/fileexchange/59646-divergence-gradient-and-curl-computation), MATLAB Central File Exchange. Retrieved .