Indcum
indcum is a short integer variable used as a default index by the sigma function. It is only relevant when a single sigma loop is used; otherwise, you need to name the variable used as a sigma index.
indcum# Let's compute a (very) approximated value of pi# The loop value cannot exceed 32,767 (short integer value)Local Decimal APPROX_PIAPPROX_PI=4*sigma(0,1000,((-1)^indcum)/(2*indcum+1))# Let's compute a (much better) approximated value of pi (David and Gregory Chudnovsky)# Due to the factorials and exponentiation used here, you cannot exceed 3 for the loop# Otherwise you will get a numeric overflowAPPROX_PI=1/(12*sigma(0,3,((-1)^indcum)*fac(6*indcum)*(13591409+(545140134*indcum))& /(fac(3*indcum)*((fac(indcum))^3)*(640320^(3*indcum+3/2)))))# Let's get the 26 letters in Latin alphabetLETTERS=sigma(65,90,chr$(indcum)) # Sum of the square numbers of the integers from one (1) to NSQUARE_SUM = sigma(1, N, indcum*indcum)Using indcum in a sigma expression performs faster than using a numeric variable.