frak.cbl is the mandelbrot fractal implemented in cobol. It compiles and runs with open-cobol/gnu-cobol and with microfocus (dialects: micro focus, acucobol and rm/cobol).
This is the well known mandelbrot fractal in arbitrary precision.
To be able to compile the programs on this page (either under Linux or Windows) you need the SDL library which can be found underneath this link.
High-color mandelbrot. The coordinates of the area that is calculated are set in the source-code.
I transformed the formula r'=r * a * (1 - r) into one using complex numbers. The results are quite amazing! The coordinates of the area that is calculated are set in the source-code.
Follow this link.