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IMSUM Returns the sum of a series of complex numbers. IMSUM(value1, [value2, ...]) IMTAN Returns the tangent of the given complex number.. IMTAN(number) IMTANH Returns the hyperbolic tangent of the given complex number. For example, a given complex number "... IMTANH(number) INDEX Returns the content of a cell, specified by row and column offset. INDEX(reference, [row], [column]) INDIRECT Returns a cell reference specified by a string. INDIRECT(cell_reference_as_string, [is_A1_notation]) INT Rounds a number down to the nearest integer that is less than or equal to it. INT(value) INTERCEPT Calculates the y-value at which the line resulting from linear regression of a dataset will inter... INTERCEPT(data_y, data_x) INTRATE Calculates the effective interest rate generated when an investment is purchased at one price and... INTRATE(buy_date, sell_date, buy_price, sell_price, [day_count_convention]) IPMT Calculates the payment on interest for an investment based on constant-amount periodic payments a... IPMT(rate, period, number_of_periods, present_value, [future_value], [end_or_beginning]) IRR Calculates the internal rate of return on an investment based on a series of periodic cash flows. IRR(cashflow_amounts, [rate_guess]) ISBETWEEN Checks whether a provided number is between two other numbers either inclusively or exclusively. ISBETWEEN(value_to_compare, lower_value, upper_value, lower_value_is_inclusive, upper_value_is_inclusive) ISBLANK Checks whether the referenced cell is empty. ISBLANK(value) ISDATE Returns whether a value is a date.. ISDATE(value) ISEMAIL Checks whether a value is a valid email address. ISEMAIL(value) ISERR Checks whether a value is an error other than `#N/A`. ISERR(value) ISERROR Checks whether a value is an error. ISERROR(value) ISEVEN Checks whether the provided value is even. ISEVEN(value) ISFORMULA Checks whether a formula is in the referenced cell. ISFORMULA(cell) ISLOGICAL Checks whether a value is `TRUE` or `FALSE`. ISLOGICAL(value) ISNA Checks whether a value is the error `#N/A`. ISNA(value) ISNONTEXT Checks whether a value is non-textual. ISNONTEXT(value) ISNUMBER Checks whether a value is a number. ISNUMBER(value) ISO.CEILING See CEILING.PRECISE ISO.CEILING(number, [significance]) ISODD Checks whether the provided value is odd. ISODD(value) ISOWEEKNUM Returns the number of the ISO week of the year where the provided date falls. ISOWEEKNUM(date) ISPMT The ISPMT function calculates the interest paid during a particular period of an investment.. ISPMT(rate, period, number_of_periods, present_value) ISREF Checks whether a value is a valid cell reference. ISREF(value) ISTEXT Checks whether a value is text. ISTEXT(value) ISURL Checks whether a value is a valid URL. ISURL(value) JOIN Concatenates the elements of one or more one-dimensional arrays using a specified delimiter. JOIN(delimiter, value_or_array1, [value_or_array2, ...]) KURT Calculates the kurtosis of a dataset, which describes the shape, and in particular the "peakednes... KURT(value1, value2) LAMBDA Creates and returns a custom function with a set of names and a formula_expression that uses them... LAMBDA(name, formula_expression) LARGE Returns the nth largest element from a data set, where n is user-defined. LARGE(data, n) LCM Returns the least common multiple of one or more integers. LCM(value1, value2) LEFT Returns a substring from the beginning of a specified string. LEFT(string, [number_of_characters]) LEFTB Returns the left portion of a string up to a certain number of bytes.. LEFTB(string, num_of_bytes) LEN Returns the length of a string. LEN(text) LENB Returns the length of a string in bytes.". LENB(string) LET Assigns names to intermediate calculated values and returns the result of a final formula express... LET(name1, value_expression1, [name2, ...], [value_expression2, ...], formula_expression) LINEST Given partial data about a linear trend, calculates various parameters about the ideal linear tre... LINEST(known_data_y, [known_data_x], [calculate_b], [verbose]) LN Returns the the logarithm of a number, base e (Euler's number). LN(value) LOG Returns the the logarithm of a number given a base. LOG(value, base) LOG10 Returns the the logarithm of a number, base 10. LOG10(value) LOGEST Given partial data about an exponential growth curve, calculates various parameters about the bes... LOGEST(known_data_y, [known_data_x], [b], [verbose]) LOGINV Returns the value of the inverse log-normal cumulative distribution with given mean and standard ... LOGINV(x, mean, standard_deviation) LOGNORM.DIST See LOGNORMDIST LOGNORM.DIST(x, mean, standard_deviation) LOGNORM.INV See LOGINV LOGNORM.INV(x, mean, standard_deviation) LOGNORMDIST Returns the value of the log-normal cumulative distribution with given mean and standard deviatio... LOGNORMDIST(x, mean, standard_deviation)