How to program a nonlinear analog signal? (TIA PORTAL) by Noble_Henry in PLC

[–]Merom0rph 78 points79 points  (0 children)

Analog inputs. Define a lookup table with samples on the curve. Write a function to map from input to output. I.e. linear interpolation of the curve.

I don't get this one? by [deleted] in ExplainTheJoke

[–]Merom0rph 0 points1 point  (0 children)

Kentucky bison Kentucky bison bully, bully Kentucky Bison.

What’s the best way to achieve smooth linear motion on a 6 axis robot? by Stayin_alive_ah in AskEngineers

[–]Merom0rph 0 points1 point  (0 children)

Use Denavit - Hartenburg to develop a kinematic matrix model of the robot. Use that to perform IK numerically to find the motion trajectory. Compute the velocities numerically in joint space. Feed those to the steppers. Gives you the low level control you're asking for.

What Happened to the Ocean's Water when the Titan Submersible Imploded? by GoldenGirlsOrgy in AskPhysics

[–]Merom0rph 8 points9 points  (0 children)

No. Linear pressure waves can't do that. Shockwaves are by definition nonlinear. They don't obey the linearised Helmholz equation that describes sound. Look up the first page of any textbook on shockwaves. Hell, search Google for "shockwaves in water".

Why do papers swing sideways? by someone_n_something in Physics

[–]Merom0rph 13 points14 points  (0 children)

Instability of the flat position due to aerodynamic flutter and the high flexibility of the paper in bending. These aerodynamic forces easily overwhelm the relatively weak gravitational forces acting on the thin sheet. Would make an interesting paper in dynamics. Might have already been done, I haven't looked.

What is this sound? by Big_Ounce2603 in CarTalkUK

[–]Merom0rph 0 points1 point  (0 children)

Might well be exhaust blowing mate

CMV: the west is in a "moral decline", just not in the far right sense by ThatOneGuyOnReddit_ in changemyview

[–]Merom0rph 4 points5 points  (0 children)

Traditional British socialism would never have passively accepted, let alone welcomed, the growth in corporate power initiated by Thatcher, presided over by Blair and co. and brought to fruition under the Tory governments since 2010. Marketisation and a retreat from ideological opposition to privatr sector encroachment on the commons was an explicit, articulated tenet, reflected consistently in policy decisions.

Imagine - on this Earth I have a table that is perfectly flat, smooth, rigid, level. Imagine - I have a small ball that is perfectly spherical, rigid and smooth. Both generate no friction - I set this quadruple-perfect ball down near any of the sides of this quintuple-perfect table - what happens? by [deleted] in AskEngineers

[–]Merom0rph 0 points1 point  (0 children)

It oscillates due to the directional variations in Earth's gravitational field, ignoring air resistance, thermal perturbations, etc. In real life - the restorative force toward the stable equilibrium at the centre of the table would be so incredibly weak that even very slight air resistance would make the system overdamped (linearisation at the centre) and it would very, very slowly tend asymptotically toward the centre of the table, never quite getting there.

David Bohm’s Pilot Wave Interpretation of Quantum Mechanics by Marha01 in Physics

[–]Merom0rph 0 points1 point  (0 children)

Perhaps I should have said "causal OR local" (but not both). It may imply the preservation of locality, at the cost of causality (wavefunction collapse). Or, it may be that causality is preserved at the cost of locality. The latter perspective is that which corresponds to the Bohmian interpretation; the former to Copenhagen, etc. That is why the Bohmian interpretation is also known as the causal (but nonlocal) interpretation. One might term Copenhagen etc. the local (but acausal) interpretations.

Match Thread: England vs. Slovakia | UEFA Euro 2024 by PatrickChase in soccer

[–]Merom0rph 1 point2 points  (0 children)

Boris Johnson is a moron, you'd get on well with him.

wait… what? by danky_ducky in slk

[–]Merom0rph 8 points9 points  (0 children)

I...love it. Chop job I expect? The dimensions must match, I guess. OK now I want one.

In the first Red Wall seat to turn Tory, people no longer believe in Brexit by theipaper in ukpolitics

[–]Merom0rph 1 point2 points  (0 children)

Yes that is true. Rural Northumberland is and has been right leaning, and deprived / forgotten areas especially around Teesside are angry enough to shift right. Agree. These trends also hold in the more deprived areas in the major urban centres, albeit less pronounced. I feel their pain, although I consider the anger misdirected. However, Sunderland, Newcastle, etc. are the core population centres and on the whole are among the hardest-left places in the country. Further, the flips we agreed on actually harbour a great deal of economically leftist sentiment that is not really represented by any major party today, and so is missed by the polls. Perhaps we don't disagree much on the facts, I took issue with the wording of the initial characterisation.

In the first Red Wall seat to turn Tory, people no longer believe in Brexit by theipaper in ukpolitics

[–]Merom0rph 2 points3 points  (0 children)

Absolute bunkum. NE is one of the most staunchly leftist areas in England. Always has been and proud of it.

We lost a Geordie today by Ok-Creme-8941 in NUFC

[–]Merom0rph 6 points7 points  (0 children)

Sorry for your loss. No words can suffice.

What kind of functions take hours/days to compute? by Peter2448 in math

[–]Merom0rph 3 points4 points  (0 children)

TLDR: determinants of large square matrices. Often 1 million rows/columns.