Bluetooth: no adapters found

Question

Im not a programer so go easy on me please ! I have a system of 4 linear equations and 4 unknowns, which I think I could use python to solve relatively easily. However my equations not of the form " 5x+2y+z-w=0 " instead I have algebraic constants c_i which I dont know the explicit numerical value of, for example " c_1 x + c_2 y + c_3 z+ c_4w=c_5 " would be one my four equations. So does a solver exist which gives answers for x,y,z,w in terms of the c_i ?

Solution 1

I got rid of "no adapters found" by simply restarting bluetooth: sudo service bluetooth restart.

Solution 2

I was having the same problem wiht same errors after upgrade on a ThinkPad X220. I've solved the problem installing bluez-utils:

sudo apt install bluez-utils

Comments

[Pilot6]

Please edit your question and add output of lsusb; rfkill list terminal command.

[Alexey Ce]

how did you get the output for bluetooth.service?

[Pygirl]

I will suggest you to look at sympy and numpy. Even if you are having coefficient in list the logic will remain the same.

[jay]

@Pygirl Oh really? Ill check it out then thanks.

[Pygirl]

look at this: pythonforundergradengineers.com/…

[Filipe]

You want to find the c_i values as a function of x,y,z?

[jay]

I want to find x,y,z,w as functions of c_i. @Filipe

[Filipe]

So you may check this numpy.org/doc/stable/reference/generated/….

[jay]

@Filipe but there all the c_i are known numerical values e.g 3 , for me I don't know them they are just some constants.

[jay]

Surprised this isn't easier to do...

[Filipe]

It seems impossible to me. I mean, if all your coefficients are variables, you have more variables than equations, so the system can not be determined.

[jay]

They are fixed constants...

[jay]

not variables, im just asking python to rearrange a system of equations. gaussian elimination. Get some solution like x= c_1+c_2 , y = c_2+3c_3 , z = c_4 , w = c_1+4c_4

[jay]

the link @Pygirl seems pretty good, cheers.

[jay]

In fact that works perfectly super easy Thanks !!!

[Filipe]

Ok, got it. numpy wont do that. You need to find something on sympy, since this is symbolic computation. If you dont really need python just solve the problem, you should try something on wolfram, maybe this: wolframalpha.com/widgets/…

[jay]

@Filipe sympy working just fine thanks :) cheers dude !

[Pygirl]

I am glad I was able to help :)

[PixelRayn]

Since you are new here i will quickly point this out: After some time you are able to confirm a solution. Since we spend quite a bit of time solving other peoples problems we'd appreciate that recognition for our work.

[PixelRayn]

Dude I am serious about that. I spent two hours on this :)

[jay]

@PixelRayn I had found a solution from Pygirls link already. But thanks anywho.