WOLFRAM SYSTEMMODELER
    SquaretimesSignOutput the product of a gain matrix with the input signal vector  | 
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SystemModel["PlanarMechanics.Utilities.SquaretimesSign"]

This blocks computes output vector y as product of the gain matrix K with the input signal vector u:
    y = K * u;
Example:
   parameter: K = [0.12 2; 3 1.5]
   results in the following equations:
     | y[1] |     | 0.12  2.00 |   | u[1] |
     |      |  =  |            | * |      |
     | y[2] |     | 3.00  1.50 |   | u[2] |
| nin | 
         Value: blockSize Type: Integer Description: Number of inputs  | 
    
|---|---|
| nout | 
         Value: blockSize Type: Integer Description: Number of outputs  | 
    
| blockSize | 
         Value: Type: Integer  | 
    
| u | 
         Type: RealInput[nin] Description: Connector of Real input signals  | 
    |
|---|---|---|
| y | 
         Type: RealOutput[nout] Description: Connector of Real output signals  | 
    
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         PlanarMechanics.Sources External force and torque acting at frame_b, defined by 3 input signals and resolved in world frame  |