Four-quadrant inverse tangent Show
SyntaxDescriptionexample P = atan2(Y,X) returns the four-quadrant inverse tangent (tan-1) of Y and X, which must be real. The atan2 function follows the convention that atan2(x,x) returns 0 when x is mathematically zero (either 0 or -0). Examplescollapse all Find Four-Quadrant Inverse Tangent of a PointFind the four-quadrant inverse tangent of the point y = 4, x = -3. Convert Complex Number to Polar CoordinatesConvert 4 + 3i into polar coordinates. theta = atan2(imag(z),real(z)) The radius r and the angle theta are the polar coordinate representation of 4 + 3i. Alternatively, use angle to calculate theta. Convert r and theta back into the original complex number. Plot Four-Quadrant Inverse TangentPlot atan2(Y,X) for -4<Y<4 and -4<X<4. Define the interval to plot over. [X,Y] = meshgrid(-4:0.1:4,-4:0.1:4); Find atan2(Y,X) over the interval. Use surf to generate a surface plot of the function. Note that plot plots the discontinuity that exists at Y=0 for all X<0. surf(X,Y,P); view(45,45); Input Argumentscollapse all Y — y-coordinates scalar | vector | matrix | multidimensional arrayy-coordinates, specified as a scalar, vector, matrix, or multidimensional array. Inputs Y and X must either be the same size or have sizes that are compatible (for example, Y is an M-by-N matrix and X is a scalar or 1-by-N row vector). For more information, see Compatible Array Sizes for Basic Operations. Data Types: single | double X — x-coordinates scalar | vector | matrix | multidimensional arrayx-coordinates, specified as a scalar, vector, matrix, or multidimensional array. Inputs Y and X must either be the same size or have sizes that are compatible (for example, Y is an M-by-N matrix and X is a scalar or 1-by-N row vector). For more information, see Compatible Array Sizes for Basic Operations. Data Types: single | double More Aboutcollapse all Four-Quadrant Inverse TangentThe four-quadrant inverse tangent, atan2(Y,X), returns values in the closed interval [-pi,pi] based on the values of Y and X, as shown in the graphic. In contrast, atan(Y/X) returns results that are limited to the interval [-pi/2,pi/2], shown on the right side of the diagram. IEEE ComplianceFor real inputs, atan2 has a few behaviors that differ from those recommended in the IEEE®-754 Standard.
Extended CapabilitiesTall Arrays Calculate with arrays that have more rows than fit in memory.This function fully supports tall arrays. For more information, see Tall Arrays. C/C++ Code Generation Generate C and C++ code using MATLAB® Coder™.GPU Code Generation Generate CUDA® code for NVIDIA® GPUs using GPU Coder™.Thread-Based Environment Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool.GPU Arrays Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox™.This function fully supports GPU arrays. For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox). Distributed Arrays Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.Version HistoryIntroduced before R2006a
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