apply a constraint to summation limits

Question

I have a list as

list={{-0.5, 5}, {-0.25, 2}, {0, 3}, {0.25, 2}, {0.5, 5}}

and I want to use of Esc+sum+Esc symbol for summation in this format:

I mean this summation:

5*ee^-0.5x + 2*ee^-0.25x + 3 + ....

However we can use of sum but I mean Is it possible to use of constrains in lower limit and upper limit in the summation symbol?

ybeltukov · Accepted Answer · 2015-11-11 20:05:26Z

4

The Mathematica way is to write

Total[#2 Exp[# x] & @@@ list]

The same with the part of the list:

Total[#2 Exp[# x] & @@@ list[[2 ;; 4]]]

Also you can write an explicit sum with EscsumtEsc:

answered Nov 11, 2015 at 19:48

ybeltukov

43.9k5 gold badges109 silver badges215 bronze badges

$\begingroup$ Wonderful and enjoyable, $\endgroup$
– Unbelievable
Commented Nov 11, 2015 at 19:52
$\begingroup$ As well as we can use of Dimensions[list][[1]] to upper limit of summation in the general case $\endgroup$
– Unbelievable
Commented Nov 11, 2015 at 20:11
$\begingroup$ @Bstates It is equivalent to Length[list] $\endgroup$
– ybeltukov
Commented Nov 11, 2015 at 20:46
$\begingroup$ Yes, Completely true $\endgroup$
– Unbelievable
Commented Nov 12, 2015 at 4:58

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