SignalIn

Description

This block is used to get variables defined in the OML workspace and use them in Activate.

The variable can be defined either in the OML shell or by a SignalOut block.

For example, the following OML command creates a variable B:

B=struct ("time", [0,1,3], "ch", {{struct("type", "double", "data", [2,5,3])}})

The Variable B defines the value of a signal at three instants 0, 1, and 3. A variable can be of any datatype supported by Activate.

A SignalOut block is usually used to create a variable acceptable by the SignalIn block. The SignalIn block can reconstruct the original signal fed to the SignalOut block in another model or simulation.

The variable provides the values of a signal V(i), at different time instants T(i). The value of the signal at times other than elements of T(i) are computed via interpolation or extrapolation. Several interpolation methods are available:"ZeroOrder", "Linear", "Not_a_knot", "Natural", and "Clamped_To_Zero".

"ZeroOrder": The element in T(i) which is the nearest and below the current time is gievn at the output, i.e.,

"Linear". This is the default method and performs a linear interpolation. If the time matches one of T elements, the output is the corresponding element in the V matrix. If no value matches the block's input, then the block performs linear interpolation between the two appropriate elements of the table to determine the output value, i.e.,

"Not_a_knot": A cubic spline is computed and used by imposing the following conditions (considering N points T(1),...,T(N)) :

"Natural": A cubic spline is computed and used by imposing the following conditions (considering N points T(1),...,T(N)) :

"Clamped_To_Zero": A cubic spline is computed and used by imposing the following conditions (considering N points T(1),...,T(N)) :

The value of the signal at time instants out of the range [T(1), T(N)] are computed via extrapolation. Several extrapolation methods are available: "Zero", "Hold", "Extrapolation", and "Repeat".

"Zero":This is the default method. In this case, the output is zero for time instants out of signal's range, i.e.,

"Hold": The output is equal to the last element of the V vector, i.e.,

"Extrapolation". The block performs linear extrapolation using two last elements of the signal, i.e.,

"Repeat". The signal is repeated over the whole range.

The variable should have "time" (time instants vector) and "ch" (channels) fields and the "ch" field should have "type" (datatype) and "data" (data values) fields.

If the variable is not defined in the OML workspace, the default value of the variable is used instead. The default value is a parameter of the block.