Axis 282 Bedienungsanleitung PDF herunterladen (Seite 48)

Chapter II-12 — Graphs

II-280

Depending on the extent of the axis, the tick mark labels may show date or date and time. You can suppress

the display of the date when both the date and time are showing by selecting the Suppress Date checkbox.

This checkbox is irrelevant when you choose the elapsed time mode in which dates are never displayed.

Use the Axis Range tab of the Modify Axis dialog to enter axis range values in terms of seconds, times, dates

or date/times. When you enter the dialog, Igor automatically chooses a format appropriate for the axis you

are working on.

Date/Time Examples

The following example shows how you can create a date/time graph of a waveform whose Y values are tem-

perature and whose X values, as set via the SetScale operation, are dates:

// Make a wave to contain temperatures for the year

Make /N=365 temperature // single precision data values

// Set its scaling so X values are dates

Variable t0, t1

t0 = Date2Secs(2000,1,1); t1 = Date2Secs(2001,1,1)

SetScale x t0, t1, "dat", temperature // double-precision X scaling

// Enter the temperature data in the wave's Y values

t0 = Date2Secs(2000,1,1); t1 = Date2Secs(2000,3,31) // winter

temperature(t0, t1) = 32 // it's cold

t0 = Date2Secs(2000,4,1); t1 = Date2Secs(2000,6,30) // spring

temperature(t0, t1) = 65 // it's nice

t0 = Date2Secs(2000,7,1); t1 = Date2Secs(2000,9,31) // summer

temperature(t0, t1) = 85 // it's hot

t0 = Date2Secs(2000,10,1); t1 = Date2Secs(2000,12,31) // fall

temperature(t0, t1) = 45 // cold again

// Smooth the data out

CurveFit sin temperature

temperature= K0+K1*sin(K2*x+K3)

// Graph the wave

Display temperature

SetAxis left, 0, 100;Label left "temp"

Label bottom "2000"

We chose Day

of Week, which

caused two

more controls to

be shown.

Custom

Format

selected.

100

temp

1/1/2000 3/1/2000 5/1/2000 7/1/2000 9/1/2000

11/1/2000

2000

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 79 80

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