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NSum
 NSum[f, {i, imin, imax}] gives a numerical approximation to the sum  .
NSum[f, {i, imin, imax, di}] uses a step di in the sum.
NSum can be used for sums with both finite and infinite limits.
NSum[f, {i, ... }, {j, ... }, ... ] can be used to evaluate multidimensional sums.
NSum[f, {i, imin, imax}] can be entered as  .
 can be entered as  sum or \[Sum].
See also: NProduct.
Examples
Using InstantCalculators
Here are the InstantCalculators for the NSum function. Enter the parameters for your calculation and click Calculate to see the result.
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Entering Commands Directly
You can paste a template for this command via the Text Input button on the NSum Function Controller.
This gives a numerical approximation to a sum.
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Ordinary Mathematical Notation
This gives a numerical approximation to a sum.
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