simplexfittable - coefficient fit of a an expression to a dependent column.

SYNOPSYS

     simplexfittable < data.tab expression fit_column [-t tol] [-d] [-D] -[i iters] fit_variable=startmin:max%delta

simplexfittable fits a expression to data in column. The expression is evaluated for each input row and may contain column and header values from the input table.

OPTIONS

• -d print a indicating the progress of the fit.
• -D debug output
• -t <toler> stopping criteria tolerence
• -i <iters> maximum iterations

A simple fit of measured data in column Y to actual position column X. The first line of the example uses jottable to creates some data to fit. The second line fits the data with simplexfittable and then neatens up the output table with justify

    john@panic : jottable X 5 | column -a Y | compute 'Y = X + gresid(.1)' > foo.tab
    johntdc : simplexfittable < foo.tab 'A*X' Y A=5 | justify


    simplexfittable A*X             Y               A=5.000000

    RMS_Y   0.0950815

    Coeff   1.00683593750000000

    X       Y               Y_Fit           Y_Res
    -       --------        --------        ---------
    1       0.995285        0.995285         0.011551
    2       2.08891         2.08891         -0.075238
    3       2.98061         2.98061          0.039898
    4       4.05656         4.05656         -0.029216
    5       5.00588         5.00588          0.0283

• svdfittable - Fit any set of columns to with linear coefficients on arbitrary basis functions.
• xyfittable - Fit one pair of X, Y columns to another pair with a linear model of translation, scale and optional shear.

• starbase.1 starbase data table introduction.
• starbase.3 starbase data table C library.
• starbase.5 starbase data table file format.