This error occurs when a number raised to the power of another number resulted in an error. For example (-4)^(-5.1) gives an error, because a negative number cannot be raised to a negative non integer number when calculating with real numbers.

tan(x) is undefined for x= π/2+πp = 90°+p180°, where p is an integer.

fact(x), which calculates the factorial number of x, is only defined for positive integers of x.

The logarithmic functions ln(x) and log(x) are undefined for x≤0, when the calculation is done for real numbers. When the calculations are done with complex numbers, x is only undefined at 0.

sqrt(x) is undefined for x<0, when the calculations are done for real numbers. sqrt(x) is defined for all numbers, when the calculations are done with complex numbers.

This error may occur when calculations are done with real numbers. If a part of the calculation resulted in a number with an imaginary part, the calculation cannot continue. An example of this is: sin(x+i)

The program tried to divide by zero when calculating. A function is undefined for values where a division by zero is needed. For example the function f(x)=1/x is undefined at x=0.

The inverse trigonometric functions asin(x) and acos(x) are only defined in the range [-1;1], and they are not defined for any numbers with an imaginary part. The function atan(x) is defined for all numbers without an imaginary part. This error may also happen if you are trying to take arg(0).

This error may occur for functions that are not defined for a specific point. This is for example the case for sign(x) and u(x) at x=0.

Inverse hyperbolic tangent atanh(x) is undefined at x=1 and x=-1, and not defined outside the interval x=]-1;1[ when calculating with real numbers only.

Inverse hyperbolic cosine acosh(x) is only defined for x≥1 when using real numbers. acosh(x) is defined for all numbers when calculating with complex numbers.

The argument of zero is undefined because 0 does not have an angle.

This error occurs when a more complicated function like W(z) is evaluated, and the evaluation failed to find an accurate result.

An argument to a function call produced a result with total loss of significant digits, such as sin(1E70) which gives an arbitrary number in the range [-1;1].

A custom function or constant no longer exists. You can either define it again or remove all uses of the symbol. This may also happen if a custom constant has been changed to a function or vice versa, or if the number of arguments to a custom function has been changed.

Too many recursive calls have been executed. This is most likely caused by a function that calls itself recursively an infinite number of times, for example foo(x)=2*foo(x). The error may also occur if you just call too many functions recursively.

A function call resulted in value too large to handle. This for example happens if you try to evaluate sinh(20000)

A custom function in a Python plugin did not return a result. The Python interpreter window may show more detailed information.

An operator +, -, *, / or ^ was misplaced. This can happen if you try entering the function f(x)=^2, and it usually means that you forgot something in front of the operator.

A right bracket is missing. Make sure you have the same number of left and right brackets.

You passed a wrong number of arguments to the specified function. Check the List of functions to find the required number of arguments the function needs. This error may occur if you for example write sin(x,3).

Only two comparison operators in sequence are allowed. For example "sin(x) < y < cos(x)" is okay while "sin(x) < x < y < cos(x)" is invalid because there are three <-operators in sequence.

Something that looked like a number but wasn't has been found. For example this is an invalid number: 4.5E. A number should be on the form nnn.fffEeee where nnn is the whole number part that may be negative. fff is the fraction part that is separated from the integer part with a dot '.'. The fraction part is optional, but either the integer part or the fraction part must be there. E is the exponent separator and must be an 'E' in upper case. eee is the exponent optionally preceded by '-'. The exponent is only needed if the E is there. Notice that 5E8 is the same as 5*10^8. Here are some examples of numbers: -5.475E-8, -0.55, .75, 23E4

You didn't enter anything in the box. This is not allowed. You need to enter an expression.

Commas may not be used as decimal separator. You have to use a '.' to separate the fraction from the integer part.

A right bracket was found unexpectedly. Make sure the number of left and right brackets match.

A factor, which may be a number, constant, variable or function, was expected.

Brackets may not be placed after a constant or variable. For example this is invalid: f(x)=x(5). Use f(x)=x*5 instead.

An expression was expected. This may happen if you have empty brackets: f(x)=sin()

You entered something that looks like a variable, function or constant but is unknown. Note that "x5" is not the same as "x*5".

An unknown character was found.

The end of the expression was found unexpectedly.

An error happened while parsing the function text. The string is not a valid function.

An overflow occurred under the calculation. This may happen when the numbers get too big.

An invalid value was used as data for the calculation.

Not enough data points were provided to calculate the trendline. A polynomial needs at least one more point than the degree of the polynomial. A polynomial of third degree needs at least 4 points. All other functions need at least two points.

Names for user defined functions and constants must start with a letter and only contain letters and decimal digits. You cannot use names that are already used by built-in functions and constants.

It is not possible to differentiate a recursive function because the resulting function will be infinitely large.

The function cannot be differentiated, because some part of the function does not have a first derivative. This is for example the case for arg(x), conj(x), re(x) and im(x).

An error occurred while calculating. The exact cause is unknown. If you get this error, you may try to contact the programmer with a description of how to reproduce the error. Then he might be able to improve the error message or prevent the error from occurring.

The given guess, which may be the default one, did not give any solution. This can be caused by a bad guess, and a better guess may result in a solution. It can also be because the given trendline model doesn't fit the data, in which case you should try another model.

No valid result exist. This may for example happen when trying to create a trendline from a point series where it is not possible to calculate a trendline. One reason can be that one of the calculated constants needs to be infinite.

Graph could not calculate an accurate result. This may happen when calculating the numerical integral produced a result with a too high estimated error.

An internal error happened. This means that the program has done something that is impossible but happened anyway. Please contact the programmer with as much information as necessary to reproduce the problem.