2014/10/16 上午 08:24:56

android Programming Glossary: sqrt

http://stackoverflow.com/questions/16392142/android-accelerometer-profiling

you'll have to look at the length of the vector i.e. sqrt X X Y Y Z Z which is independent of the device orientation... smoothing as part of that algorithm Here is a graph of sqrt X X Y Y Z Z from Sensor.TYPE_ ACCELEROMETER which I recorded.. measured when I walked for 100 steps. The green line is sqrt X X Y Y Z Z the blue line is an exponentially weighted moving..

Display Good-looking Math Formula in Android

http://stackoverflow.com/questions/17029780/display-good-looking-math-formula-in-android

I modify to directly render an equation from a string say sqrt b^2 4ac Here is the initial header for webview WebView w WebView.. 'math' .innerHTML ' doubleEscapeTeX sqrt b^2 4ac ' w.loadUrl javascript MathJax.Hub.Queue 'Typeset' MathJax.Hub..

How to calculate distance from different markers in a map and then pick up the least one

http://stackoverflow.com/questions/19218081/how-to-calculate-distance-from-different-markers-in-a-map-and-then-pick-up-the-l

22.572646 88.363895 from math import sin cos atan2 sqrt EARTH_RADIUS 6373 # km def distance a b # pass tuples lat1 lon1.. a sin dlat 2 2 cos lat1 cos lat2 sin dlon 2 2 c 2 atan2 sqrt a sqrt 1 a return EARTH_RADIUS c current 17.385044 78.486671.. dlat 2 2 cos lat1 cos lat2 sin dlon 2 2 c 2 atan2 sqrt a sqrt 1 a return EARTH_RADIUS c current 17.385044 78.486671 # current..

Implement page curl on android?

http://stackoverflow.com/questions/3912849/implement-page-curl-on-android

by vertex vi.x vi.y around A on the x y plane R sqrt vi.x vi.x pow vi.y A 2 Now get the radius of the cone cross..

Page curl/turn effect in Android [duplicate]

http://stackoverflow.com/questions/4376962/page-curl-turn-effect-in-android

by vertex vi.x vi.y around A on the x y plane R sqrt vi.x vi.x pow vi.y A 2 Now get the radius of the cone cross..

Abstracted LCD Density

http://stackoverflow.com/questions/4533300/abstracted-lcd-density

x and y are the horizontal and vertical resolution so that sqrt x x y y is the length of the diagonal in pixels and d is the.. in pixels and d is the length of the diagonal in inches sqrt x x y y d So for example a LG Optimus One P500 is listed as..

why getSpeed() always return 0 on android

http://stackoverflow.com/questions/4811920/why-getspeed-always-return-0-on-android

you'll need to calculate for absolute distances sqrt currentGPSPointX lastGPSPointX ^2 currentGPSPointY lastGPSPointY..

android compass seems unreliable

http://stackoverflow.com/questions/6256256/android-compass-seems-unreliable

sensors with each other and take the square root of that sqrt x x y y z z and make sure it's between 25 and 65 or so this..

JTransforms FFT in Android from PCM data

http://stackoverflow.com/questions/7649003/jtransforms-fft-in-android-from-pcm-data

the FFT peak with the largest magnitude where Magnitude sqrt re re im im The index i of this largest magnitude peak will..

How to get frequency from fft result?

http://stackoverflow.com/questions/7674877/how-to-get-frequency-from-fft-result

at index i you want re fft 2 i im fft 2 i 1 magnitude i sqrt re re im im Then you can plot magnitude i for i 0 to N 2 to.. fft for i 0 to N 2 1 re fft 2 i im fft 2 i 1 magnitude i sqrt re re im im find largest peak in power spectrum max_magnitude..

Android Accelerometer Profiling

http://stackoverflow.com/questions/16392142/android-accelerometer-profiling

so the individual values of X Y and Z won't be any use. Instead you'll have to look at the length of the vector i.e. sqrt X X Y Y Z Z which is independent of the device orientation. You only need to smooth the data if you're feeding it into something.. other end so don't prejudge whether it's necessary to include smoothing as part of that algorithm Here is a graph of sqrt X X Y Y Z Z from Sensor.TYPE_ ACCELEROMETER which I recorded when I was building my pedometer. The graphs shows the readings.. I was building my pedometer. The graphs shows the readings measured when I walked for 100 steps. The green line is sqrt X X Y Y Z Z the blue line is an exponentially weighted moving average of the green line which gives me the average level..

Display Good-looking Math Formula in Android

http://stackoverflow.com/questions/17029780/display-good-looking-math-formula-in-android

is meant for user input. Which part of the code should I modify to directly render an equation from a string say sqrt b^2 4ac Here is the initial header for webview WebView w WebView findViewById R.id.webview w.getSettings .setJavaScriptEnabled.. if url.startsWith http bar return w.loadUrl javascript document.getElementById 'math' .innerHTML ' doubleEscapeTeX sqrt b^2 4ac ' w.loadUrl javascript MathJax.Hub.Queue 'Typeset' MathJax.Hub This will set a string This is plain text in normal..

How to calculate distance from different markers in a map and then pick up the least one

http://stackoverflow.com/questions/19218081/how-to-calculate-distance-from-different-markers-in-a-map-and-then-pick-up-the-l

19.075984 72.877656 'Chennai' 13.052414 80.250825 'Kolkata' 22.572646 88.363895 from math import sin cos atan2 sqrt EARTH_RADIUS 6373 # km def distance a b # pass tuples lat1 lon1 a lat2 lon2 b dlon lon2 lon1 dlat lat2 lat1 a sin dlat 2.. tuples lat1 lon1 a lat2 lon2 b dlon lon2 lon1 dlat lat2 lat1 a sin dlat 2 2 cos lat1 cos lat2 sin dlon 2 2 c 2 atan2 sqrt a sqrt 1 a return EARTH_RADIUS c current 17.385044 78.486671 # current lat lng closest None closest_name None for name cordinates.. lat1 lon1 a lat2 lon2 b dlon lon2 lon1 dlat lat2 lat1 a sin dlat 2 2 cos lat1 cos lat2 sin dlon 2 2 c 2 atan2 sqrt a sqrt 1 a return EARTH_RADIUS c current 17.385044 78.486671 # current lat lng closest None closest_name None for name cordinates..

Implement page curl on android?

http://stackoverflow.com/questions/3912849/implement-page-curl-on-android

input vertex. vi inputMesh_ ii Radius of the circle circumscribed by vertex vi.x vi.y around A on the x y plane R sqrt vi.x vi.x pow vi.y A 2 Now get the radius of the cone cross section intersected by our vertex in 3D space. r R sin theta..

Page curl/turn effect in Android [duplicate]

http://stackoverflow.com/questions/4376962/page-curl-turn-effect-in-android

Abstracted LCD Density

http://stackoverflow.com/questions/4533300/abstracted-lcd-density

along the diagonal can be calculated by this formula where x and y are the horizontal and vertical resolution so that sqrt x x y y is the length of the diagonal in pixels and d is the length of the diagonal in inches sqrt x x y y d So for example.. resolution so that sqrt x x y y is the length of the diagonal in pixels and d is the length of the diagonal in inches sqrt x x y y d So for example a LG Optimus One P500 is listed as having a screen resolution of 320 by 480 and a diagonal screen..

why getSpeed() always return 0 on android

http://stackoverflow.com/questions/4811920/why-getspeed-always-return-0-on-android

This is how I did it when I made a runner app. More specifically you'll need to calculate for absolute distances sqrt currentGPSPointX lastGPSPointX ^2 currentGPSPointY lastGPSPointY ^2 time between GPS points It might help to make a new..

android compass seems unreliable

http://stackoverflow.com/questions/6256256/android-compass-seems-unreliable

point doesn't it NOTE you can multiply and sum the magnetic sensors with each other and take the square root of that sqrt x x y y z z and make sure it's between 25 and 65 or so this is one indicator you can use to detect anomalous fields but..

JTransforms FFT in Android from PCM data

http://stackoverflow.com/questions/7649003/jtransforms-fft-in-android-from-pcm-data

sinusoidal tone in the input waveform then you need to find the FFT peak with the largest magnitude where Magnitude sqrt re re im im The index i of this largest magnitude peak will tell you the approximate frequency of your sinusoid Frequency..

How to get frequency from fft result?

http://stackoverflow.com/questions/7674877/how-to-get-frequency-from-fft-result

are at index 2 i 1 . To get the magnitude of the spectrum at index i you want re fft 2 i im fft 2 i 1 magnitude i sqrt re re im im Then you can plot magnitude i for i 0 to N 2 to get the power spectrum. Depending on the nature of your audio.. on fft buffer calculate power spectrum magnitude values from fft for i 0 to N 2 1 re fft 2 i im fft 2 i 1 magnitude i sqrt re re im im find largest peak in power spectrum max_magnitude INF max_index 1 for i 0 to N 2 1 if magnitude i max_magnitude..