Error bars in Igor Pro

ErrorBars attaches to a trace and reads its bars from waves or from an expression.

Function AddErrorBars(WAVE means, WAVE sds)
    ErrorBars/T=0/L=2 $NameOfWave(means) Y, wave=(sds, sds)

    Duplicate/O sds, upper, lower
    upper = means + sds
    lower = means - sds

    ErrorBars $NameOfWave(means) SHADE={0, 2, (0, 0, 65535, 16384),
                                        (0, 0, 0, 0)}
    ModifyGraph mode=4, marker=19, msize=3
End

How it works

1. Y, wave=(plus, minus) takes them from two waves.
2. /T=0 removes the end caps; /L= sets their length.
3. shade={...} draws a filled band instead of bars.

Keywords and builtins used here

• Duplicate
• End
• ErrorBars
• Function
• ModifyGraph
• WAVE
• wave

The run, in numbers

Lines

11

Characters to type

292

Tokens

91

Three-star pace

85 tpm

At the three-star pace of 85 tokens a minute, this run takes about 64 seconds.

Type this snippet

Step 4 of 4 in Marking it up, step 15 of 19 in Graphs & presentation.

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