towards using gather and ppc in shapepath

matlab/SCRATCH.m

@@ -1,19 +1,38 @@
 
-raw=desPos_actPos.Data
-raw(:,2)=raw(:,1)*100
-ft=fft(raw);
-plot(log(abs(ft)));
-plot(log(abs(ft(:,1)./ft(:,2))));
+https://de.wikipedia.org/wiki/Chirp
 
-      i=int(minFrq*tSec); j=int(maxFrq*tSec); #print(w[i],w[j])
+#      amp, minFrq, maxFrq, tSec = (10, 10, 300, 30)
+import numpy as np
+import matplotlib as mpl
+import matplotlib.pyplot as plt
+x=np.arange(1,300000)
+y=10*np.sin(31.415926535897931*( pow(1.058324104020218,(x*0.000199996614513)) -1) /np.log(1.058324104020218))
+plt.show()
+plt.plot(x,y)
+plt.show()
 
+y=amp*sin( a* (b**(x*c))-1) / log(d) )
+  =amp*sin( a/log(d)* (b**(x*c))-1)  )
 
-x=2+3j
-rho=abs(x)
-theta=angle(x)
-%-------------------
-x=rho*exp(j*theta)
+0.000199996614513=samplingrate in sec. (gatherPeriod==1?)
+31.415926535897931 = pi*10 =? 2*pi*f0
+1.058324104020218 = k
+x*0.000199996614513 =t
+1.058324104020218**60 = 30
 
+sin( 2*pi*f0/ln(k)*(k**t-1) )
+f(t)=f0*k**t = f0*e**(t*ln(k))
+
+k**t=30 (from 10 to 300 -> 300/10=30)
+
+log(k**t)=log(30)
+log(k)*t=log(30)
+log(k)=log(30)*(1/t)
+log(k)=log(30**(1/t))
+k=30**(1/t)
+30**(1/60.) = 1.0583241040202176
+
+-----------------------------------------------------------------
 
 
   figure();
@@ -21,10 +40,6 @@ x=rho*exp(j*theta)
   setoptions(h,'FreqUnits','Hz','Grid','on');legend('location','sw');
 
 
-
-
-
-
   %figure();bode(ssc.ss_o(3));
   %figure();tf=tf(ssc.ss_o) pzplot(tf(3));