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Mathematical Expressions
QCad comes with a built in mathematical expression parser called
'fparser'. The parser was written by
Juha Nieminen 'Warp'
of the
Tampere University of Technology
Finland. Whenever there are input fields which expect a real value from the
user, you can type any expression that is recognized by the parser instead.
This way you always have a powerful calculator at hand.
Supported Constants
Supported Functions
The following table lists all functions supported by the expression
parser. You can also find the same table in the
original
documentation of 'fparser'
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abs(A)
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Absolute value of A.
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acos(A)
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Arc-cosine of A. Returns the angle, measured in degrees, whose
cosine is A.
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acosh(A)
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Same as acos() but for hyperbolic cosine.
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asin(A)
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Arc-sine of A. Returns the angle, measured in degrees, whose sine
is A.
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asinh(A)
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Same as asin() but for hyperbolic sine.
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atan(A)
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Arc-tangent of (A). Returns the angle, measured in degrees, whose
tangent is (A).
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atan2(A,B)
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Arc-tangent of A/B. The two main differences to atan() is that it
will return the right angle depending on the signs of A and B (atan()
can only return values between -pi/2 and pi/2), and that the return
value of pi/2 and -pi/2 are possible.
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atanh(A)
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Same as atan() but for hyperbolic tangent.
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ceil(A)
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Ceiling of A. Returns the smallest integer greater than A. Rounds
up to the next higher integer.
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cos(A)
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Cosine of A. Returns the cosine of the angle A, where A is
measured in degrees.
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cosh(A)
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Same as cos() but for hyperbolic cosine.
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cot(A)
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Cotangent of A (equivalent to 1/tan(A)).
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csc(A)
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Cosecant of A (equivalent to 1/sin(A)).
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eval(...)
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This a recursive call to the function to be evaluated. The number
of parameters must be the same as the number of parameters taken by
the function. Usually called inside if() to avoid infinite
recursion.
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exp(A)
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Exponential of A. Returns the value of e raised to the power A
where e is the base of the natural logarithm, i.e. the non-repeating
value approximately equal to 2.71828182846.
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floor(A)
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Floor of A. Returns the largest integer less than A. Rounds down
to the next lower integer.
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if(A,B,C)
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If int(A) differs from 0, the return value of this function is B,
else C. Only the parameter which needs to be evaluated is evaluated,
the other parameter is skipped; this makes it safe to use eval() in
them.
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int(A)
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Rounds A to the closest integer. 0.5 is rounded to 1.
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log(A)
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Natural (base e) logarithm of A.
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log10(A)
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Base 10 logarithm of A.
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max(A,B)
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If A>B, the result is A, else B.
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min(A,B)
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If A<B, the result is A, else B.
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sec(A)
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Secant of A (equivalent to 1/cos(A)).
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sin(A)
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Sine of A. Returns the sine of the angle A, where A is measured in
degrees.
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sinh(A)
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Same as sin() but for hyperbolic sine.
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sqrt(A)
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Square root of A. Returns the value whose square is A.
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tan(A)
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Tangent of A. Returns the tangent of the angle A, where A is
measured in degrees.
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tanh(A)
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Same as tan() but for hyperbolic tangent.
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