JAX and reordering

Writerside/d.tree

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     <toc-element topic="On-using-AI-to-write-about-writing.md"/>
+    <toc-element topic="Sudo-must-die.md"/>
+    <toc-element topic="LLM-on-SSD.md"/>
+    <toc-element topic="tinyFramebuffer.md"/>
+    <toc-element topic="is-JAX-cool.md"/>
     <toc-element topic="Reverse-Engineering.md">
         <toc-element topic="SOMe-unnamed-software.md"/>
         <toc-element topic="IsProcessorFeaturePresent.md"/>
         <toc-element topic="Fastfail-Codes.md"/>
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-    <toc-element topic="Sudo-must-die.md"/>
-    <toc-element topic="LLM-on-SSD.md"/>
-    <toc-element topic="tinyFramebuffer.md"/>
     <toc-element topic="Fortran.md">
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Writerside/topics/is-JAX-cool.md

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+# is JAX cool ?
+
+Python is slow, and don't get me started on how it "call C".
+Even numpy is slow (except for slow computations, then it's relatively fast).
+
+Is JAX cool ? Does it "make Python fast" ?
+Perhaps.
+
+It can be a straight-up replacement for numpy, but faster (on GPU, TPU, or CPU fallback).
+
+## Testing stuff
+
+```Python
+
+import jax.numpy as jnp
+from jax import grad, jit, vmap
+from jax import random
+import matplotlib.pyplot as plt
+
+%matplotlib inline 
+
+x = jnp.arange(0,2*jnp.pi,0.1)   # start,stop,step
+
+for j in range(20):
+  y = 0
+  for i in range(1,j,2):
+    y += jnp.sin(x*i)/i
+    plt.plot(x,y)
+plt.show()
+
+```
+
+To be honest, it's not a good benchmark to compare with numpy.
+I'm just putting it here because i always forget how to make square waves from sin (Fourier series).
+
+But it look like numpy, so it's cool.
+
+![squareFFT.png](squareFFT.png)
+
+There is probably a more JNX-ish wat to do it, but how ? Ask Copilot chat ?
+
+Copilot is still using loops. Perhaps it's how it's done in JAX.
+
+I'll need to try some other examples. Perhaps Fractals, or Fractals.
+
+## Hello mandelbrot
+