# arccos¶

## Purpose¶

Computes the inverse cosine.

## Format¶

y = arccos(x)
Parameters: x (NxK matrix or N-dimensional array) – y (NxK matrix or N-dimensional array) – containing the angle in radians whose cosine is x.

## Examples¶

/*
** Format print statements to show 3 digits
** after the decimal point
*/
format /rd 6,3;

x = { -1, -0.5, 0, 0.5, 1 };
y = arccos(x);

print "x = " x;
print "y = " y;


The code above, produces the following output:

x =
-1.000
-0.500
0.000
0.500
1.000
y =
3.142
2.094
1.571
1.047
0.000


## Remarks¶

If x is complex or has any elements whose absolute value is greater than 1, complex results are returned.

trig.src