Array comparisons 2

[haynewp]

I am new at arrays in Mathcad. How can you compare the corresponding values in 2 arrays and write the maximum of the 2 to a new array?

For instance I have an array called "a" which has 1 column and 3 rows. I want to compare each value to the same position in "b" and write the maximum for each position to a new array called "c".

When I use c=max(a,b) it just returns one value for "c" instead of a new array.

 

[rd78]

Do it for each element ....

i:= 1..rows(a)
c:=max(a[i,b[i)

Rick D.

 

[IRstuff]

Type c:max(a,b) select the entire max(a,b) expression and type <ctrl><minus>, which will vectorize the function and perform it for each element in each vector.

Also, the above posting should say c[i:max(a[i,b[i) if you want to go that route.

TTFN

 

[Diquan]

I was looking for something like that long time ago, now i make what rd78 and IRstuff said and nothing happends, i tried to <ctrl> <minus> and the arrow won't stay on of the (a,b), look:

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[GregLocock]

Try initializing c in your final attempt, which otherwise looks fine to me. ie insert c[i:0 just below i:1;rows(a)

Sorry, i don't know if that will work, it just seems likely.



Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[IRstuff]

Default array indices in Mathcad start at 0. Therefore, the range variable i should be defined as i:0;rows(a)-1.

The error message relates to trying to access a[3 and b[3, which don't exist.

TTFN

 

[Diquan]

Thanks to --> IRstuff

It worked!! look,.....