Changing Steps in a loop

Hello Guys,

I have a small issue with a loop, which needs to have some kind of dynamic steps.

The context is the following, I am working on a 5 business days, which is normal week. Normally the calculations start on monday which is referenced as 2 in Matlab, but there are weeks where Mondays are bank holidays, so here I have my issues, because a constant step will not help if I do the following :

   Heres are the data : 
    Mon  1416.18  733414
    Tue  1390.19  733415
    Wed  1409.13  733416
    Thu  1420.33  733417
    Fri  1401.02  733418
    Mon  1416.25  733421
    Tue  1380.95  733422
    Wed  1373.2  733423
    Thu  1333.25  733424
    Fri  1325.19  733425
    Tue  1310.5  733429
    Wed  1338.6  733430
    Thu  1352.07  733431
    Fri  1330.61  733432
    Mon  1353.96  733435
    Tue  1362.3  733436
    Wed  1355.81  733437
    Thu  1378.55  733438
    Fri  1395.42  733439
    Mon  1380.82  733442

    Code 
    step = 5
    for i : 2 : step : n

    if DayNumber == 2

    calculations when first day is monday
    end  

    if DayNumber == 3 ( tuesday)

    do operation

    step = step -1
    end

    end

so here normally, i expected an i of 2,7,12,16( Not 17), then 21( 16+5, back to step 5)

Unfortunately I am getting always a constant step of 5, do you know how to make the loop reactive to the steps.

thanks

Davin

Answer 1

[Image Analyst]

The code doesn't run. The data needs to be a cell array and you didn't do that for us, so I'm not even going to try it. Basically if your loop step/increment/counter needs to vary during each iteration then you can't use a "for" loop - you need to use a "while" loop. Make your variable defined correctly and I might fix it for you.

Answer 2

[Davin]

Hello,

Thanks for your answer. As the code is long I didnt want to paste it all, yes a while loop could help, but I am having difficulties to implement it.

You will see attached to this message, the mat environment plus the testpattern.m.

to launch it just type pattern(GSPC), the issue comes around row 17, where it should iterate to 21, but it does start at 22, which is wrong.

The code is a bit bulky because it defines a number of possible paths..

thanks very much.

Davin