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MathGroup Archive 1998

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Re: question on ErrorBar



Ben Yung wrote:
> 
> I'm having trouble with using the ErrorBar option in the
> MultipleListPlot.  I have a list of datapoints {x,y}, as well as a list
> of errors {xerror, yerror}.  The syntax is as follows:
> 
> MultipleListPlot[{{x1,y1},ErrorBar[{xerror1,yerror1}]},{{x2,y2},
> 
> {{x2,y2},ErrorBar[{xerror2,yerror2}]},{etc.....}]
> 
> Is their a convenient way to input my two lists?
> 
> Thanks!

Assume a list of values and errors as below:

values={{1,2},{1,2},{2,3},{4,5},{6,7},{8,9},{0,1}}; errors=
{{0.1,0.2},{0.3,0.4},{0.5,0.6},{0.7,0.8},{0.9,0},
{0.11,0.12},{0.13,0.14}};


Map[ErrorBar,errors]

Returns

{ErrorBar[{0.1,0.2}],ErrorBar[{0.3,0.4}],ErrorBar[{0.5,0.6}],
  ErrorBar[{0.7,0.8}],ErrorBar[{0.9,0}],ErrorBar[{0.11,0.12}],
  ErrorBar[{0.13,0.14}]}


So that the correct list for input to MultipleListPlot is

Transpose[{values,Map[ErrorBar,errors]}]

{{{1,2},ErrorBar[{0.1,0.2}]},
{{1,2},ErrorBar[{0.3,0.4}]},
{{2,3},ErrorBar[{0.5,0.6}]},
{{4,5},ErrorBar[{0.7,0.8}]},
{{6,7},ErrorBar[{0.9,0}]},
{{8,9},ErrorBar[{0.11,0.12}]},
{{0,1},ErrorBar[{0.13,0.14}]}}

The syntax you asked for is given by

Flatten[Transpose[{values,Map[ErrorBar,errors]}],1] 

{{1,2},ErrorBar[{0.1,0.2}],
{1,2},ErrorBar[{0.3,0.4}],
{2,3},ErrorBar[{0.5,0.6}],
{4,5},ErrorBar[{0.7,0.8}],
{6,7},ErrorBar[{0.9,0}],
{8,9},ErrorBar[{0.11,0.12}],
{0,1},ErrorBar[{0.13,0.14}]}

but I don't think this will work in MultipleListPlot.


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