DPlot file keywords

Following is a list of all of the 2D keyword identifiers currently supported by DPlot. For keywords following eqn below (poli, poly, etc.) DPlot generates at least 256 data points per curve. The spacing between X values is dependent on the type of scaling used. On linear scales, the X values will be evenly spaced. On logarithmic scales, the X values will appear to be evenly spaced (the logarithms of X are evenly spaced).

data

File consists of data points.

keyword-specific data:

nPoints(i)

do j = 1 to nPoints(i)

x(j,i), y(j,i)

end do

Data points (Y values only) with constant spacing between x values

keyword-specific data:

nPoints(i)

do j = 1 to nPoints(i)

y(j,i)

end do

XStart(i), XStop(i)

eqn

General equation following the syntax rules used by Y=f(X) and similar commands.

keyword-specific data:

equation

XStart,XStop,dX

where dX is the constant spacing between points.

poli

Polynomial: y = C(1)+ C(2)x + C(3)x^2 + C(4)x^3 + ...

keyword-specific data:

nTerms(i)

do j = 1 to nTerms(i)

C(j)

end do

XStart(i), XStop(i)

poly

Polynomial: y = C(1)x^Z(1) + C(2)x^Z(2) + ....

keyword-specific data:

nTerms(i)

do j = 1 to nTerms(i)

C(j,i), Z(j,i)

end do

XStart(i), XStop(i)

expo

Exponential: y = exp[C(1)x^Z(1) + C(2)x^Z(2) + ... ]. Keyword-specific data has the same form as that for "poly".

exp2

Exponential: y = C(1) + C(2)exp[C(3)x]

keyword-specific data:

C(1,i), C(2,i), C(3,i)

XStart(i), XStop(i)

pl10

Common logarithm: y = C(1)+ C(2)log10(x) + C(3)(log10(x))^2 + ... Keyword-specific data has the same form as that for "poli".

plog

Common logarithm: log10(y) = C(1)+ C(2)*log10(x) + C(3)*(log10(x))^2 + ... Keyword-specific data has the same form as that for "poli".

slog

Semi-log: log10(y) = C(1)x^Z(1) + C(2)x^Z(2) + .... Keyword-specific data has the same form as that for "poly".

In addition, modifiers may be applied to alter the data generated with the keywords listed above (for all but "data" and "eqn").

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