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JBlackhole16-Pearl
16-Pearl
Aug 26, 2014 7:35 AM UTC
Solved

Summing function Wm(time,a,b,c,d) from m=0 to m=n ?

To all,

I am sure I saw something about how to do such thing but I cannot find it so needs some pointers

I have a function (see attached mcad sheet) Wm(t,am,bm,cm,dm) where t is time and am,bm,cm,dm are coefficient valid for equation m

I need to do sum of Wm from m =0 to n: Capture.PNG but I am struggling with indices in mcad

Coudl anyone refreshe my memory on this summation? It might be something with "dicretizing" the time 't' if I recall

Thanks

Regards

JXB

JBlackholeAnswer
16-Pearl
Aug 26, 2014 12:47 PM UTC

Thanks to all for the help. Moving on to the next bit of the tool....

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14 replies

MikeArmstrong1-Visitor
1-Visitor
Aug 26, 2014 7:57 AM UTC

Like the attached?

I have change t from a range variable to a vector and also removed the units s the program works.

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AlanStevens19-Tanzanite
19-Tanzanite
Aug 26, 2014 7:57 AM UTC

The attached should help.

Alan

Looks like Mike just beat me to it!

Edit: Just noticed that your original file was a .mcd, so I've added a .mcd version here.

Mike: In your file the definition of Wm still contains tdm < t > tdm+Nm/2fm. I suspect this should be tdm < t < tdm+Nm/2fm (though I could be wrong!).

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JBlackhole16-PearlAuthor
16-Pearl
Aug 26, 2014 8:25 AM UTC

Hi Alan

Thanks for the help. Am I correct to say that the Sum only works for a specific t value and not a range of t. Using Mike suggested method, I reckon that one needs to use two range variables

i for the vectorised time t

m for the number of coefficient (a,b,c,d) to consider

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AlanStevens19-Tanzanite
19-Tanzanite
Aug 26, 2014 8:56 AM UTC

J B wrote:

Hi Alan

Thanks for the help. Am I correct to say that the Sum only works for a specific t value and not a range of t. Using Mike suggested method, I reckon that one needs to use two range variables

i for the vectorised time t

m for the number of coefficient (a,b,c,d) to consider

The sum as written only works for a specific value of t, but you could include this sum within another that summed over the values of t.

Alan

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JBlackhole16-PearlAuthorAnswer
16-Pearl
Aug 26, 2014 12:47 PM UTC

Thanks to all for the help. Moving on to the next bit of the tool....

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