At calculation of a logarithm two input parameters - some number over which operation, and auxiliary value - the basis is carried out are used. The number which shows degree in which it is necessary to build the basis is result of operation to receive podlogarifmenny value. In the majority of calculators there are built-in functions for finding of logarithms with the bases equal 10 and mathematical constant e.
Instruction
1. For calculation of a logarithm with the basis equal 10 enter initial number and press the button noted by a log symbol on the calculator. If you use the program calculator which is built in the Windows operating system that in a set of buttons also this appeared it it is necessary to switch to the "engineering" interface. Therefore press a combination of the Alt keys + 2 or select the Engineering item in the section "Look" of the menu of the program. Right after pressing of the log button you will see result of calculations.
2. Operation of finding of a natural logarithm which basis to equally mathematical constant e, is made also simply - to enter initial number enough and to press the calculator button. In this case use the button designated by ln symbols.
3. There is no similar function for logarithms with other bases usually in calculators, but it does not mean that they are not suitable for such operations. The basis can be changed if to use a simple formula - the logarithm from some number (B) on any basis (a) is equal to the relation of a logarithm of the same number on other basis (x) to a logarithm of the old basis on new: logₐB = logₓB/logₓa. As work with the basis equal 10 is provided in any calculator, use it as "transit" parameter.
4. Realize the algorithm described in the previous step in such a way: at first enter the basis of an initial algorithm and press the log button. The received value will be a fraction denominator until place it in memory of the calculator - press the M+ key. Enter number from which it is necessary to take a logarithm, and again press the log button - so you receive fraction numerator. Press the division button / and as a divider use memory contents - press the MR button. Receive final result of calculation of a logarithm by means of a key with an equal-sign.