Open post Toni @giorginolab@mstdn.science · 7mo ago Replying to @SecularJeffrey@ohai.social <p>This is the future they stole from us</p><p>Edit: see replies for more information by fellow tooters</p> @SecularJeffrey@ohai.social When wood was cheaper than electronics
Open post Toni @giorginolab@mstdn.science · 7mo ago Replying to @markarayner@mas.to on mas.to @markarayner@mas.to of course: the image was not resized properly! it's horizontally stretched.
Open post Toni @giorginolab@mstdn.science · 7mo ago Replying to @nickofnz@mastodon.nz <p>I don't want a city on Mars.<br />I don't want AI in every app.<br />I don't want data centres in space.</p><p>I want clean water.<br />I want a stable climate.<br />I want bees to survive.</p> @nickofnz How selfish of you /s
Open post Toni @giorginolab@mstdn.science · 3mo ago Replying to @giuseppebilotta@fediscience.org <p>OK I'm going to need ask the Fediverse for some math help here, because I have a feeling I'm forgetting something obvious and can't find the resources I'd need to answer my own question.</p><p>Let's say I have an underdetermined linear system. The methods generally employed to solve these find the least (l2) norm solution, which is generally acceptable.</p><p>However, in my case, I need to find solutions that satisfy some constraint (simple inequality constraints: solution must be in a box, with known ranges [min max] for each variable).</p><p>I think I have had a brain freeze because the only approach I can think of to solve this is to turn the problem into a constrained optimization problem. However, in my case (hundreds of thousands of variables) this is not computationally feasible: the time needed for the optimization approach is ridiculously higher than the standard linear system solution.</p><p>OTOH, I have a vague feeling that it should be possible to approach this differently, possibly remaining in the domain of the linear system resolution. What am I missing?</p><p><a href="https://fediscience.org/tags/askFedi" class="mention hashtag" rel="tag">#<span>askFedi</span></a> <a href="https://fediscience.org/tags/fediHelp" class="mention hashtag" rel="tag">#<span>fediHelp</span></a> <a href="https://fediscience.org/tags/askMath" class="mention hashtag" rel="tag">#<span>askMath</span></a> <a href="https://fediscience.org/tags/mathHelp" class="mention hashtag" rel="tag">#<span>mathHelp</span></a> <a href="https://fediscience.org/tags/mathematics" class="mention hashtag" rel="tag">#<span>mathematics</span></a></p> @giuseppebilotta@fediscience.org linear programming? I think there are solvers for very large problems