I copied the following code from a tutorial on Maxima, and find that it does not wotk with wxMaxima: "FOR A:-3 THRU 26 STEP 7 DO LDISPLAY(A)$" I get the error : "(%i1) FOR A:-3 THRU 26 STEP 7 DO LDISPLAY(A)$ Incorrect syntax: a is not an infix operator FORSpaceA:" Am I doing something wrong? Thanks Carl David ^