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##

`.measure` Line

- General Form:

` .measure dc|ac|tran `*result* *interval* |
*point* [*measurements*]

.measure dc|ac|tran *result* param=*expression*

The `dc|ac|tran` specifies the analysis type for which the
measurement is active. The *result* is a token, starting with a
letter, which will be used to uniquely identify the results of the
measurement. A vector with this name will be added to the current
plot, if the measurement is successful.

The rest of the line can have various formats. The next part of the
statement is either an *interval* specification, or a single *point* specification.

There is a second form available, as shown above. In this case, after
all *interval* and *point* measurements have been performed,
the *expression* will be evaluated and the result saved in *result*. The *expression* can reference other measurement results
in addition to the usual vectors and functions provided by the system.
These measurement lines are evaluated in the order found in the input.

In `.measure` lines, single-quote marks or parentheses can be used
to delimit complicated expressions. The usual single-quoted
expression expansion performed when input is sourced is **not**
applied to `.measure`> lines. Instead, internally, the single
quotes are replaced by parentheses, preventing expression expansion
but allowing parameter substitution, which is performed at the same
time.

Vector names found in `.measure` lines are added to the internal
save list, guaranteeing that the necessary data will be available when
needed, whether or not the vector has been mentioned in a `.save`
line.

**Subsections**

** Next:** Point and Interval Specification
** Up:** Parameter Measurement
** Previous:** Parameter Measurement
** Contents**
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Stephen R. Whiteley
2017-02-22