A flexwire is a thin wire that allows a single signal to pass through it.
- adaptive Bulirsh-Stoer
Uses rational polynomials to extrapolate a series of substeps to a final estimate.
This algorithm is highly accurate for smooth functions.
- adaptive Runge Kutta 5th order
Obtains fifth order accuracy. This algorithm automatically takes small step sizes
through discontinuities in the input function and large strides through smooth functions.
- backward Euler (Stiff)
Obtains efficiency for systems with high and low frequencies. The other algorithms
would require small step sizes to maintain stability.
- check boxes
List choices that you can turn on or off by clicking on them. On Windows, an X indicates
that the selection has been turned on. On UNIX/X, a recessed check box indicates
that it has been turned on.
- check mark
A few commands activate or suppress actions in VisSim. When the check mark is present,
the action is activated; when the check mark is absent, the action is suppressed.
Positioning the pointer and pressing down and releasing a mouse button. Since most
actions use the left mouse button, when you read "click the mouse" or "click on,"
you should click the left mouse button.
- command buttons
Carry out immediate actions when pressed. A command button with three trailing dots
(...) opens another dialog box. If a command button is dimmed, it is not currently
available for use. The currently selected, or default, command button has a darker
border. You can choose the default command button by pressing the ENTER key.
- connector tabs
Triangular shaped inputs and outputs on blocks that allow data to enter and exit
Dimmed commands are commands unavailable for use. Commands can be unavailable for
use because they may require that you select one or more blocks before you can execute
the command, or because they require the installation of additional Visual Solutions
- display boxes
Provide visual representations of your selections.
Positioning the pointer and pressing down and releasing the mouse button twice,
in rapid succession. Since most double-clicking actions use the left mouse button,
when you read "double-click the mouse" or "double-click on," you should double-click
the left mouse button.
Holding down the mouse button and moving the pointer.
Evaluates once per simulation time step and is least affected by singularities.
This method is fastest for moderate step sizes.
- Fletcher Reeves
Requires fewer iterations to convergence. This conjugate gradient algorithm is slower
than Powell’s method.
- list boxes
List of similar items. Scroll through the items using the scroll bars, and select
an item by double-clicking on it or by clicking on it and then on an affirmative
Moving the mouse so the pointer is positioned over text or graphics on the screen
A conjugate gradient algorithm that is a bit more sophisticated than Fletcher Reeves
for arriving at the supposed minimum of the quadratic form.
A direction-set algorithm that typically runs faster because it does not explicitly
calculate the gradient.
- radio buttons
List two or more mutually exclusive choices. You select a choice by clicking on
its associated button. On Windows, a black spot indicates that it has been selected.
On UNIX/X, a recessed diamond indicates that it has been selected.
- Runge Kutta 2nd order
Obtains second order accuracy. This method uses a midpoint step derivative to calculate
the final integration value. Specify the length of the step in the Step Size box.
- Runge Kutta 4th order
Obtains fourth order accuracy. This method evaluates the derivative four times at
each time step: once at the initial point, twice at sample midpoints, and once at
a sample endpoint. The final integration value is then derived based on these derivatives.
- short-cut keys
Key sequences that indicate that a command can be executed from the keyboard. If
the keys are separated by a plus sign, hold the keys down simultaneously. If they're
separated by a comma, press and release each key in the order shown.
- text boxes
Contain text strings. Click on the existing string to select it for editing. Use
the DEL or BACKSPACE key to delete text. DEL removes characters after the pointer;
BACKSPACE removes them before the pointer.
- three trailing dots
A command with three trailing dots (...) displays a dialog box in which to gather
additional information about the command. Only after you make the appropriate selections
and close the dialog box (using an affirmative button, like Yes or OK) is the command
Evaluates twice per simulation time step.
- vector wire
A vector wire is a single, thick wire that contains multiple flexWires. You bundle
flexWires into a vector wire using the scalarToVec block. Conversely, you unbundle
them with the vecToScalar block. Typically, vector wires are used to perform group
operations on index, merge, variable, wirePositioner, and all arithmetic blocks,
and to reduce wiring clutter at top level diagram design.