csc

Cosecant of input angle in radians

Syntax

Y = csc(X)

Description

Y = csc(X) returns the cosecant of the elements of X. The csc function operates element-wise on arrays. The function accepts both real and complex inputs.

• For real values of X, csc(X) returns real values in the interval [-∞, -1] and [1, ∞].

• For complex values of X, csc(X) returns complex values.

Examples

Plot Cosecant Function

Plot the cosecant function over the domain $$-\pi <x<0$$ and $$0<x<\pi$$ as shown.

x1 = -pi+0.01:0.01:-0.01; 
x2 = 0.01:0.01:pi-0.01;
plot(x1,csc(x1),x2,csc(x2)), grid on

Cosecant of Vector of Complex Angles

Calculate the cosecant of the complex angles in vector x.

x = [-i pi+i*pi/2 -1+i*4];
y = csc(x)

y = 1×3 complex

   0.0000 + 0.8509i   0.0000 + 0.4345i  -0.0308 - 0.0198i

Input Arguments

X — Input angle in radians

scalar | vector | matrix | multidimensional array | table | timetable

Input angle in radians, specified as a scalar, vector, matrix, multidimensional array, table, or timetable.

Data Types: single | double | table | timetable
Complex Number Support: Yes

Output Arguments

Y — Cosecant of input angle

scalar | vector | matrix | multidimensional array | table | timetable

Cosecant of input angle, returned as a real-valued or complex-valued scalar, vector, matrix, multidimensional array, table, or timetable.

More About

Cosecant Function

The cosecant of an angle, α, defined with reference to a right angled triangle is

$$\text{csc}(\alpha )=\frac{1}{\sin \left(\alpha \right)}=\frac{\text{hypotenuse}}{\text{opposite side}}=\frac{h}{a}.$$

The cosecant of a complex argument, α, is

$$\text{csc}\left(\alpha \right)=\frac{2i}{e^{i\alpha }-e^{-i\alpha }}.$$

Tips

• In floating-point arithmetic, csc is a bounded function. That is, csc does not return values of Inf or -Inf at points of divergence that are multiples of pi, but a large magnitude number instead. This stems from the inaccuracy of the floating-point representation of π.

Extended Capabilities

Tall Arrays

Calculate with arrays that have more rows than fit in memory.

The csc 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.

This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment.

GPU Arrays

Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox™.

The csc function fully supports GPU arrays. To run the function on a GPU, specify the input data as a gpuArray (Parallel Computing Toolbox). 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™.

This function fully supports distributed arrays. For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox).

Version History

Introduced before R2006a

R2023a: Perform calculations directly on tables and timetables

The csc function can calculate on all variables within a table or timetable without indexing to access those variables. All variables must have data types that support the calculation. For more information, see Direct Calculations on Tables and Timetables.