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 InstantCalculatorsHere 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 DirectlyYou 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 NotationThis gives a numerical approximation to a sum.
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