The is_numeric functions works just fine. It returns trueor false based on whether the input variable is numeric or not. However, it is possible that unexpected results may occur when evaluating something like "34e6", which is a valid number (34,000,000). If you must know if a variable contains only digits 0-9, consider preg_match("/^\d+$/", $input) or similar.
Trigonometric functions are defined from a numeric domain to a numeric range. So the input number determines whether or not the function is defined for that value and, if so, what the value of the function is.
Substitute the given value for the argument of the function.
In Excel you can use the ISNUMBER() function.
To return the absolute, positive value of a numeric expression.
use the _itoa function
numeric perception is a value of perception to the numeric value
To evaluate a function means to replace the variable with some value, and calculate the value of the function. For example, in the parabola y = x2 (or, using functional notation, f(x) = x2), if you replace x with 10, and calculate x2, you are evaluating the function for that specific value.
You substitute the variable for its value. Or you substitute the variables for each of the values.
The numeric value is 509882096
The numeric value is 165.
10000 is a numeric value.
The numeric value is 6.