atan2

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: The final output should be like image(HELLO WORLD): Here is what i am doing:- $im = imagecreate ( 400 , 400 ); $txtcol = imagecolorallocate ( $im , 0xFF , 0x00 , 0x00 ); $size = 20 ; $txt = 'DUMMY TEXT' ; $font = './font/Capriola-Regular.ttf' ; /*two points for base line*/ $x1 = 50 ; $x2 = 300 ; $y1 = 150 ; $y2 = 170 ; /*bof finding line angle*/ $delta_x = $x2 - $x1 ; $delta_y = $y2 - $y1 ; $texangle = ( rad2deg ( atan2 ( $delta_y , $delta_x )) * 180 / M_PI )- 360 ; /*eof finding the line angle*/ imageline ( $im , $x1 , $y1 , $x2 ,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have U and V wind component data and I would like to calculate wind direction from these values in R. I would like to end up with wind direction data on a scale of 0-360 degrees, with 0° or 360° indicating a wind blowing to the north, 90° indicating a wind blowing to the east, 180° indicating a wind blowing to the south and 270° indicating a wind blowing to the west. Below is some example data: > dput(wind) structure(list(u_ms = c(-3.711, -2.2417, -1.8188, -1.6164, -1.3941, -1.0682, -0.57611, -1.5698, -1.4976, -1.3537, -1.0901, -0.60403,

1.理论 本文采用的模型为之前博客“ matlab机器人工具箱一般六轴的DH模型和改进DH模型建立与区别 ”里面的改进DH模型，参数不再重复给出。 基系与工具坐标系关系为： b T 0 （ 0 T 1 1 T 2 2 T 3 3 T 4 4 T 5 5 T 6 ） 6 T e = b T e b T 0 （ 0 T 1 1 T 2 2 T 3 3 T 4 4 T 5 5 T 6 ） 6 T e = b T e 将逆运动学问题简化为： 0 T 1 1 T 2 2 T 3 3 T 4 4 T 5 5 T 6 = b T 1 0 b T e 6 T 1 e 0 T 1 1 T 2 2 T 3 3 T 4 4 T 5 5 T 6 = b T 0 1 b T e 6 T e 1 2.转换为下式求解 2 T 3 3 T 4 4 T 5 = 1 T 1 2 0 T 1 1 b T 1 0 b T e 6 T 1 e 5 T 1 6 2 T 3 3 T 4 4 T 5 = 1 T 2 1 0 T 1 1 b T 0 1 b T e 6 T e 1 5 T 6 1 左边： left = [ cos (theta3)* cos (theta4)* cos (theta5) - sin (theta3)* sin (theta5), - cos (theta5)* sin (theta3) - cos

Math has defeated me once again. This is such a simple task, but I can't manage to get it done. Scenario: I draw on a SurfaceView a round image. The user touches a point on image border and starts to drag it adround. I need to rotate the circle image according to user movement. I have two important piece of information, the image center X,Y coordinates and the touched points coordinates. As you can see in the image, the user touched a point, according to my draw the touched point angle should be around 40. I can't manage to calculate it properly. I tried using this formula: angle = Math.atan2

I want to calculate the magnitude and the angle of 4 points using neon instructions SIMD and arm assembly. There is a built in library in most languages, C++ in my case, which calculates the angle (atan2) but for only one pair of floating point variables (x and y). I would like to exploit SIMD instructions that deal with q registers in order to calculate atan2 for a vector of 4 values. The accuracy is required not to be high, the speed is more important. I already have a few assembly instructions which calculate the magnitude of 4 floating-point registers, with acceptable accuracy for my

I have U and V wind component data and I would like to calculate wind direction from these values in R. I would like to end up with wind direction data on a scale of 0-360 degrees, with 0° or 360° indicating a wind blowing to the north, 90° indicating a wind blowing to the east, 180° indicating a wind blowing to the south and 270° indicating a wind blowing to the west. Below is some example data: > dput(wind) structure(list(u_ms = c(-3.711, -2.2417, -1.8188, -1.6164, -1.3941, -1.0682, -0.57611, -1.5698, -1.4976, -1.3537, -1.0901, -0.60403, -0.70812, -0.49045, -0.39849, 0.17875, 0.48356, 1.5082