Nicolas Raynaud nraynaud

why are greases made of a metallic soap mixed with an oil?

Greases are made of a metallic soap mixed with an oil because this combination creates a semi-solid lubricant that combines the lubricating properties of oils with the structure and stability provided by soaps.

Here’s how it works:

Metallic soaps act as a thickener.
- A metallic soap is a compound formed by reacting a fatty acid with a metal hydroxide (such as lithium, calcium, sodium, or aluminum hydroxide).

This reaction produces a fibrous or sponge-like structure that can trap and hold oil within it — much like a sponge holds water.

Me

generate the corner values with the cross terms of the hessian, and show your code is correct in a comment

AI Assistant

I'll generate the corner values with cross terms for the Hessian matrix and create code to demonstrate its correctness.Looking at the code in the test file, I can see there's a function that needs to be completed to generate corner values with cross terms of the Hessian. Let me examine the current implementation and complete it: generateNeighborhood

    function generateNeighborhood (centerVal, gradient, hessian) {
      const neighborhood = [new Array(9).fill(0), new Array(9).fill(0), new Array(9).fill(0)]
      const setVal = (val, i, j, k) => {
        neighborhood[k][i + 3 * j] = val

Me

can you write compute_least_squares ?

AI Assistant

I'll write the function for you. Based on the context, this appears to be for refining extrema positions in a computer vision/image processing algorithm (likely SIFT or similar), where you need to solve the linear system Hx = -g to find the sub-pixel offset. compute_least_squares

fn compute_least_squares(hessian: mat3x3f, gradient: vec3f) -> vec3f {
    // Solve Hx = -g for x, where H is the Hessian and g is the gradient
    // This gives us the sub-pixel offset for extrema refinement

Notes on the mechanical design of the Sojourner rover

The data has been moved to a proper github repo: https://github.com/nraynaud/sojourner/blob/main/

	from enum import Enum

	class spinel_status_t(Enum):
	#< Operation has completed successfully.
	SPINEL_STATUS_OK = 0
	#< Operation has failed for some undefined reason.
	SPINEL_STATUS_FAILURE = 1
	#< Given operation has not been implemented.
	SPINEL_STATUS_UNIMPLEMENTED = 2
	#< An argument to the operation is invalid.

	; stop.g
	; called when a print is cancelled after a pause.

	T-1
	G1 X100 Y350 F35000

	# SPDX-License-Identifier: MIT
	#
	# Copyright (C) 2024 Olliver Schinagl <oliver@schinagl.nl>

	ARG UBUNTU_VERSION="22.04"
	ARG TARGET_ARCH="library"

	FROM index.docker.io/${TARGET_ARCH}/ubuntu:${UBUNTU_VERSION}

	ENV HOME="/build"

	<?xml version="1.0" encoding="UTF-8"?>
	<ufwb version="1.17">
	<grammar name="VMDK" start="id:6" author="Nicolas Raynaud" email="nraynaud@gmail.com" fileextension=".vmdk">
	<description>VMDK streamOptimized file format. Licenced under Affero GPL, the copyright owner is Vates SAS. This is a work for hire by Nicolas Raynaud.</description>
	<scripts>
	<script name="Sector64" type="DataType" id="142">
	<source language="Python"># custom data type script

	def parseByteRange(element, byteView, bitPos, bitLength, results):
	# this method parses data starting at bitPos, bitLength bits are remaining

	#include "am5729-beagleboneai.dts"
	// make it easy to determine which dtb you're currently running on
	// (via /proc/device-tree/chosen/)
	/ {
	chosen {
	base_dtb = "am5729-beagleboneai-custom.dts";
	base_dtb_timestamp = __TIMESTAMP__;
	};
	};
	// eventually these should be available in a header