12.17. - sa save data points
lists the current data points to the screen or to a file, just as
its does in the plot program.
There is a difference in the format,
though, when the points are written to the screen.
sa
or
sa filename [a|w]
Refer to the description of
sa in Chapter 3 for an explanation
of this command.
The difference in screen format from the plot program
version of
sa is shown in the following example.
(The data presented
here is used in the straight-line fit examples elsewhere in this chapter.)
x y weight yfit residual
10 48.9343 0.142953 50.4044 0.210153
11 56.32 0.13325 54.4217 -0.252944
12 53.9749 0.136114 58.4391 0.607637
13 67.6994 0.121537 62.4564 -0.637217
14 73.7787 0.116422 66.4738 -0.850451
15 80.0557 0.111765 70.4911 -1.06898
16 69.4587 0.119988 74.5085 0.605915
17 64.9841 0.12405 78.5258 1.67984
18 72.0632 0.117799 82.5432 1.23454
19 99.7246 0.100138 86.5605 -1.31823
20 98.2006 0.100912 90.5779 -0.769229
The second to last column is the value calculated using the model
equation and the current parameters.
The last column is the weighted
residual, wi(yi - yfiti).
The
sa command in the plot program produces the following for
the same data.
10 48.9343 6.99531
11 56.32 7.50469
12 53.9749 7.34678
13 67.6994 8.22795
14 73.7787 8.58944
15 80.0557 8.94734
16 69.4587 8.33417
17 64.9841 8.06126
18 72.0632 8.48903
19 99.7246 9.98622
20 98.2006 9.90962
Here the third column is the error-bar value rather than the weight
(which is the inverse of the error-bar value).
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