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$$$$ PRNS     NOTICE  CHAT      11/09/12    21:17:44     7124           
                                             DATE     11/09/12

    Operateur PRNS                           Voir aussi : RESPOWNS
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    EVOL1 = PRNS EVOL2 EVOL3 LREEL1 (LREEL2 FLOT1 MOT1 MOT2 COUL1)
                            (   MOT3 (ENTI1) (FLOT2) (TPL)  )
                            (   MOT4  DTIME    )           ;



    Description :
    _____________

    Calculation of the spectrum of response EVOL1 (including one
    curve) associated with :

    - the power spectrum EVOL2 (including one curve) of a "virtual" 
      stationary signal of period TE.

    - and N modulation curves EVOL3 in relation to time (including N
      curves) corresponding to the wavebands specified in LREEL1 
      [the waveband of the i-th function EVOL3 is given by the i-th
      (low frequency) and the i+1-th (high frequency) element of
      LREEL1].

    The modulation functions must all start at the same time
    TI and end at the same time step TF. The signal duration TE is
    given by TF-TI. The distribution of maxima follows Newmark/
    Gumble 1 law.

    Options :
    _________

    - The calculation of the spectrum of response is performed on
      a period grid composed of 75 points, ranging between 0.04s (25 Hz) 
      and TE which are uniformly distributed in a logarithmic space. An
      alternative grid can be given in option in LREEL2.

    - The spectrum of response is calculated for a standard damping
      of 0,05. The FLOT1 option makes it possible to specify a
      different damping.

    - MOT1 stands for the response physical magnitude : 'ACCE'(leration),
      'VITE'(sse) (velocity) or 'DEPL'(acement relatif) (relative 
      displacement). The default is 'ACCE'.

    - MOT2 stands for the magnitude in abscissa of EVOL1 :
      'PERI'(od) or 'FREQ'(uency). The default is 'PERI'.

    - COUL1 stands for the color of the created object.
      By default, it is the color of EVOL2.

    - The non-stationary part of the calculation (transfer function of
      oscillators) refer to K stationary processes. The time interval
      defined by EVOL3 is thus divided into K equal parts and a time
      numerical integration on each interval is performed on M 
      equidistant time steps. The non-stationary modulation can be non
      null beyond TE : the integration can be completed on an additional 
      duration TPL. In addition, iterative processes (e.g. zero requested
      at a PREC precision) may be carried out in order to define the 
      distribution. MOT3 enables the specification of K and M on the
      one hand, TPLU and PREC on the other. If the value of MOT3 is
      'NBPR'(ocess), ENTI1 specifies K. If the value of MOT3 is
      'NBIN'(tegration), ENTI1 specifies M. If the value of MOT3 is 
      'TPLU'(s), FLOT2 specifies TPL. If the value of MOT3 is 'PREC'
      (ision), FLOT2 specifies PREC. If the value of MOT3 is 'NBDE'
      (fault), K corresponds to processes of about 2 seconds, M equals 
      10, TPL equals 20 seconds and PREC equals 1.E-3. The default for
      MOT3 is 'NBDE'.

    - The non-stationary part of the calculation may refer to a
      wavelet modelization if MOT4 equals 'ONDE'. In this case, EVOL2
      contains as many points as there are wavebands and EVOL3
      contains the modelization of wavelet coefficients : the first
      curve is the residue and the following ones are connected with
      each level of decomposition (from low to high frequencies).
      DTIME indicates the sampling period associated with the residue.
      In this case, M and K cannot be specified any longer.