The indexed multiplication

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The indexed multiplication is the sum of  a numerical object, named value to be multiplied obtained when a variable (called the index  variable) takes all the integer values between the start and end values of index specified.

The result is calculated as follows :

Variable index is given all the integer values from mini value to maxi value. Each time, all the elements elements of the figure depending on  value to be multiplied and depending on variable index are re-calculated. The value to be multiplied is multiplied to the result and so on.


Let us have a simple example :

We have already defined a real function f , a variable N current value of which is 10.

We wish to calculate the multiplication of all f(k) for k in the range from 1 to N.

We will use a variable k with minimal value of 1, maximal  value of 100, step 1 and current value 2. We will notice that mini, maxi values and the step values of the variable are not used by the sum

The we create a calculus named v (the value to be multiplied) that will contain the formula f(k).

The we will use the menu Calculus - New real calculus -Indexed multiplication.

Enter P as name for the multiplication.

Choose v as value to be summed.

Choose k for index variable.

Choose 1 for start index.

Choose N for end index.


To be noticed  : This multiplication is dynamic.Modifying  N value will modify the result.