Cartesian to polar

Similar Questions

• Effectiveness of the Cartesian to spherical coordinate of the conversion

  I use a VI in the LV 2014 distribution called ".vi NI_AALPro.lvlib:3D Conversion of coordinates (scalar)". It uses DBL inputs and outputs and has several functions of table build in it as a library function call. I need to make a massive number of Cartesian to spherical conversions with SGL values, and so I would like to re - write this VI using LV primitives most efficiant manner.

  The calculation seems to be pretty simple, and I've attached a VI that does this. However, there is a problem with the calculation of the polar angle. From what I've read online, this is just arctan (y / x), but I get incorrect values when x is negative (but not when there is negative).

  From what I've read on the site of Wolfram, "the inverse tangent must be properly set to the right quadrant of (x / y) into account." I searched online for more details on the calculation, but I'm lost. Any trig works there who can help me?

  Definitions are extremely important in the definition of coordinate systems.  You include with your VI Cart_to_Sph documents of many errors and inconsistencies.

  This is a convention that I use and which seems to be acceptance quite wide (I'm not sure that's the convention of Wolfram, however).

  Let X, Y and Z is a right coordinate system.  That P is a point whose X, Y, Z coordinates we know.  Define a system of spherical polar coordinates (SSC) as follows:

  • Project of a line from the origin to P.
  • RADIUS (rho) - length of the line from the origin to P.
  • The line of the project on the X - Y plane.
  • Azimuth (theta) - measured Angle to the left of the x-axis for this proposed line.  By convention, theta varies less pi (radians), pi.
  • Polar angle (phi) - the angle between the axis Z (or 'pole') and the line from the origin to P.  By convention, including phi between 0 and pi.

  Under this system of coordinates, the following code (very similar to Altenbach, which uses a slightly different coordinate system) cards X, Y, Z in Rho, Theta, Phi:

  

  We will check certain quantities of 'known '.  Start with the x-axis of the unit, [1, 0, 0].  This clearly has length, Rho = 1.    The X axis lies in the XY, so the angle between the latter and the Z axis is 90 °, Phi should be pi/2.  Finally, the projection of the X axis in the XY plane is located along the X axis, so the angle between the two axes of X is 0, so Theta should be 0.  The first Re / Im polar will give 1, Theta Yes 0 = 0.  The second will give 1, pi/2, and Yes 1 = Rho and Phi = pi/2.

  How about unit Z, [0, 0, 1]?  Again, the length, Rho, is 1.  Technically, since the z plans on the origin, the Azimuthal angle cannot be properly defined (the X coordinates and are 0), so we'll do a loophole 'math' and just say that it is zero.  The polar angle is easy - the angle between the Z axis and the pole, the Z axis is 0, so Phi = 0.  Now "do the math".  Put [0, 0] in the first Re / Im polar gives [0, 0], so theta = 0.  The second d / Im to polar takes [1, 0] [1, 0], Rho Yes = 1 and Phi = 0.

  It is easy to show (in particular by the coding of this place and put in test of numbers) that negative quantities are working properly.  Rho is always non-negative, Phi is always in the range 0... PI and theta of pi-pi, with the sign depends on the sign of Y (as it should).

  Bob 'just do the math' Schor

  PS - If you think this is fun, just try 3D rotation matrices...

• Connectivity of polar issues H7

  I use a polar H7 Bluetooth monitor during my workouts. I have a problem when the watch is always the H7, but sometimes do not connect, especially in the gym. It connects very well at home or out of the gym. Can anyone help this is very frustrating.

  Something to the gym is interfering with the connection you need to know what it is. Until it resets your watch by holding down the digital Crown and the side button, wait for the Apple logo, release the buttons. After doing this you can forget your previous matching with the H7 and pair it again.

• SmartWatch. c the polar watch

  I'm trying to decide between buying a smartwatch or a Polar watch to track my fitness, heart rate, etc... Any thoughts?

  The smart watch is that you consider the Apple Watch? If this isn't the case, it is perhaps not the place for the question.

  In my opinion, the Apple Watch fine for basic fitness and then some. However, if you are training for a race where the precise rhythm and time are critical, you can consider a dedicated watch with built-in GPS.

  See dcrainmaker.com for customers of lots of fitness gadgets. Many fitness watches have features of type Smart Watch (e.g. text and call notifications).

• I have a problem, see the screen of my iPhone when you're wearing Polarized Sunglasses. Someone else?

  Someone else just to see their iPhone 6 or Air when you wear Polarized Sunglasses?  My screen seems to low intensity upright, I wear Polarized Sunglasses of Rx a lot.  S in Arizona.

  I had this problem with a screen of the device.  It is the effect of polarization lenses.  The only way for the clear screen had to take off the sunglasses - helping you if they are your Rx lenses.  I think you need to stick to the horizontal scenes to avoid the effect.

• Compaq Mini 110: Polarity of power supply jack

  Hello

  I have a HP/Compaq Mini 110 that was given to me because both the battery and the AC adapter was lost. I have a power supply of the correct voltage (19 VDC) and can get an outlet of the right size. I need to know what the polarity of the plug must be, for example, is the center of the end positive or negative? I also need to know if the computer will be also powered if one battery (even dead) is not installed. If it will power-up with the polarity a/c adapter, I'm going to buy a battery, otherwise I don't lose money. Shame on HP/Compaq to not show a pictorial of polarity on the camera body. If I can get going, have enough moxie upgrade to Windows 10? Thank you.

  Here is the Service Manual:

  Manual

  See p. 54 on the hard drive. She straight plug the motherboard, but it shows a cart or make sledding which does not move there and the SSD is welded to a SATA connector. For some time I took one of these apart.

  He's a regular SATA and the size limit, it's what is on the market, not the hardware, so you could theoretically install a 2 TB or a 2.5 inch SATA SSD. You could probably get one inch 80 gig SATA SSD 2.5 for a pittance and it would run as well as he is capable of running.

  The memory you have is DDR2-800, but the system he clocks up to speed DDR2-533.

  The power Jack is soldered to the motherboard and there is no way I know to stretch upward. A lot of youtube videos on the welding on a new jack and you can find the plug for a few dollars. It is not a work that I do, but I saw several times and I think you can probably manage it if you have the soldering equipment.

  If this has answered your questions please make it easier for others to find by marking "accept as a Solution.

• can Apple Watch connect with monitor polar heart

  can Apple Watch connect with monitor polar heart?

  Hello

  If you are referring to the H7 polar, then Yes, we can.

  Firstly turn off pairing the monitor from other devices which he may previously have paired with (for example your iPhone), then:

  • Wear the polar H7 (which lights up by being broken to the strap and rotates when detached).
  • On Apple Watch, go to settings > Bluetooth.
  • Wait that Polar H7 appears, then press it.

• HP50g: Strange table HP50g Representation when polar mode

  Hi all

  I noticed that under certain conditions, an array of real numbers is represented very strangely on the HP50g.

  The situation is, I have my polar coordinates to the value and I create an array of real numbers using ARRY->.

  For example, in the RPN, I put 1, 2 and 3 on the stack, type 3 and then use the command ARRY, telling the calculator that I intend to create a table of 3 elements by using the 3 previous values on the stack->.

  I expect to see is a table with items 1, 2 and 3, but this isn't what's happening. Instead, I get the polar form (1.2) for the first two elements, then the number 3 (see image).

  If I change from rectangular coordinates table shows what I expected, but it still seems strange to the polar form what is happening. Conversely, if I create the matrix using other methods, for example, the MTRW application, it does not happen even under the same conditions.

  Any ideas on the issue?

  Thank you all in advance

  Spoiler (Highlight to read)

  

  Just a wild guess: does still happen after running the CASCFG command, which resets the CASE settings to their default values?  I tried many settings of the indicator and have not been able to reproduce the behavior you describe, but I still think it's a flag setting causing your trouble.  Unless you have an installed library that changes the display, whereby the Paris are open.

  DISCLAIMER: I do not work for HP, or for someone else.

• Problem with the polar H7 and Apple Watch mating

  I'm trying to pair a polar H7 to my Apple Watch.  Bluetooth under settings, the watch detects polar device, but is not pair.  (The wheel continues to spin and it reads not 'connected').  I've disabled the watch and tried again but still the same result.  Can anyone help?

  Hello

  • Wear the polar H7 (which lights up by being broken to the strap and rotates when detached).
  • On Apple Watch, go to settings > Bluetooth.
  • Wait that Polar H7 appears, then press it.

  If the monitor has already been associated with another device (for example, your iPhone), try it unpairing from that first.

• angles, positive and negative area on a plot of polar

  Is there a way to label the sector on a polar plot angles with +/-values? We generate a lot of bosses of directivity of sonar and angles scored from-180 to 180 instead of 0 to 360 have long been the norm. Looking at the definition of the curve and Polar - display the tab - it doesn't seem to be an obvious way to do it.

  Hi Greg,.

  Unfortunately, there is no way to do in tiara at the moment. I presented a report of Corrective Action to resolve this (#323394), and I hope that this feature will be included in a future version of DIAdem. Thank you for that bring to our attention.

  Kind regards

  Jackie

• How puedo ingresar diferent ángulos in una grafia is polar plot of the o compass plot is?

  Buenas quisiera put diferent ángulos in una polar modo grafica Québec me sirva para el valanceo hasta hora rotores dismantle e solo s can enter UN angulo solo o varios finished el ultimo punto pero lo in verdad quisiera realize are put varios ángulos con diferente punto of origen that no sea (0,0)

  Aqui don't coloco los examples that e led pero no los quiero como puntos, if no lineal como

  Necromonller pido disculpas por las so many tardanzas as tuve.

  El documento in the 2011 version editor y 2012 para that can open any that is fits him best.

  Saludos!

• Problem with several polar plots

  I have a vi where I graph three plots using the polar plot vi.  The problem is that one of the graphics are messed up when I draw all.

  

  You can see that the outer circle does not look right.  However, when I have the probe after the individual parcels, they seem to be ok, except the last.

  I have attached a strongly simplified VI.

  The first chart, you must draw the grid and it works fine.  So for all subsequent graph you can change the color of the transparent grid so it's not redraw on the other plots.

• Plot XY to polar trace

  The plot required is a polar plot to draw the objectives is to identify a radar detector. I traced a XY Chart with coordinates obtained remotely and measures of angles.

  I want to draw this positions X and Y in the polar plot. Source to the XY graph is a cluster of 2 elements while the connection to the Polar curve needs a picture 1 d of the cluster. The individual data are table 1 d of double and make a bundle does not solve the problem.

  Please let me know how to build the polar plot with distance and angle data.

  Kind regards

  
  

• Rotate a Cartesian table field

  Hello

  Suppose I have a 2d array(360x2) which is taken from text file and all the elements are converted to Cartesian and placed in the xy table and plotted as well. Now, I want to turn xy table traced using slides. I enclose 2 files of text corresponding to the r-theta table and xy table. Kindly help me ths issue.

  Well, it's the way in which the angle of turns of complex numbers.

  Why did you put r = 3 default? Just to make sure that we can not see the data?

  Why not clean the diagram and replace the bundle with "RE / IM at the complex.

  You you use Q & R to divide the angle by 360 table and use the rest to wrap correctly. (See photo)

  

• Problema con el polar field indicator

  Hola a tod@s,

  Tengo a problema con el polar route VI indicator, he estado intentado dibujar UN fasor (vector) este empleando VI, he configurado su tamano is colores pero cuando ejecuto el VI none as black me graphics mi fasor (vector), para verificar what he estado introduciendo datos he graficado training in waveform una Onda y aqui obtengo el resultado esperado (Una funcion con seno amplitude fase y frecuencia deseada) , help me could alguien con el problema del indicator polar. I am using LabView 7.1 8.5 y y en versiones both me sucede lo mismo.

  Editor una imagen del diagrama of blocking the graphical grafica y.

  Gracias

  Hello

  Aqui ha UN UN convertacion pictura.  Not soy seguro that're correcto, LEDs 'dt' al anugulo.  Pero, este callida hasta solution, convert el hondo.

  Desculpa, no tengo LabVIEW 7 here.  No will can be extracted using of este, pero the pictura is mostra as quero decir lo.  Buena suerte.

  Los resultos son estranyo (no tengo 'July' , I think it is the process of converting, no correcto are.)