Posted on April 16, 2014 at 10:00pm
by Dr. Saeid Nourian
Surprisingly there are not many downloadable calculators that allow
defining variables easily. Even when they do, it involved elaborate
multi-dialog settings. Fortunately there is Smart Math Calculator, a
calculator that is engineered for ease of use and flexibility.
This calculator is also capable of solving equations for unknown
variables however this article will only focus on the task of creating
and using variables.
In Smart Math Calculator you can create a new variable by simply
using the = sign. For example if you type TotalValue=5.0+3.5 the
variable TotalValue will be instantly created and hold the value of 8.5.
You can reuse this variable in the next lines. For example if you type
2*TotalValue+10 the result will be instantly computed to be 27.
Once you define a variable you can change its value by assigning a
new value to it (i.e. TotalValue=100). You may also perform some
arbitrary operation on the original value to obtain a new value. For
example to do an incremental operation on our variable simply type
TotalValue=TotalValue+4 in the second line to increment the original
value of 8.5 by 4 to get 12.5 as the new value of TotalValue.
Smart Math Calculator allows you to define as many variables as you
want and reuse them as often as you like. The following example
demonstrate how to create 4 variables, some of which depend on others
for their value:
Note that the value of the variable 'c' is 'a' raised to the power of
2 + 'b'.
The beauty of this calculator is that as soon as you change the value
of one variable, the value of all variables that depend on that variable
are recalculated. Observer in the following screenshot how the results
of the 3rd and 4rd lines are changed when you change the value of
variable a from 5 to 6:
Define Global Constants
every example you have seen until now, you can only use your variables
in the current session. If you create a new file, then you need to
declare your variables again. If you use a particular number often, then
you can define it as a global constant so that it will always be
available for use.
To see the list of constants already defined in Smart Math Calculator
click on "View" menu, then click on "Function Library". You will see a
list of categories, subcategories, and functions/constants. If you click
on Physics > Constants, you will see a list of common physics constant.
If you click on Mp you will see a brief description of what Mp is.
To define your own function simply click on the + button under
Functions. It will bring up New Function dialog box that allows you to
define your new constant variable or function. You can define a variable
to hold your current mortgage interest rate.
For the purpose of this example I left the category as Physics but
feel free to create your own category much the same way as creating new
constant. When you're done click OK. Now you will be able to use
MyMortgageInterestRate variable in all your future calculations.
All of the above features are available free in Smart Math
Calculator. Download free variable calculator or the online variable