input.hoc

// input.hoc
// Olfactory bulb network model: define procedures to set-up input
// Andrew Davison, The Babraham Institute, 2000.

strdef odourfile,inputfile
objref odour, inputarray
objref A, X, S
odour = new Vector(nof)
inputarray = new Matrix(nmitx,nmity)


proc set_no_input() {
  for i = 0, nmitx-1 {
    for j = 0, nmity-1 {
      inputarray.x[i][j] = 0.0
      input[i][j].amp = inputarray.x[i][j]
    }
  }
}


proc add_uniform_input() { local i,j // 2 args - min and max input
  for i = 0, nmitx-1 {
    for j = 0, nmity-1 {
      inputarray.x[i][j] += random.uniform($1,$2)
      input[i][j].amp = inputarray.x[i][j]
    }
  }
}


proc add_focal_input() {  // 4 args - max input, centre coords and half-width of spot
  for i = 0, nmitx-1 {
    for j = 0, nmity-1 {
      inputarray.x[i][j] += $1*exp(-2.77259*((i-$3)*(i-$3)+(j-$2)*(j-$2))/($2*$2))
      input[i][j].amp = inputarray.x[i][j]
      //print i,j,input[i][j].amp
    }
  }
}



proc generate_odour_matrix() { local i,j,r,ix,iy,k,l,min,max
  A = new Matrix(nglom,nof) 	// A is set here and should
                		// not be changed elsewhere
  S = new Matrix(nmitx,nmity)   // X and S are local
  X = new Vector(nglom)     	// matrices

  r = random.normal(0.0,0.5)

  // Generate original matrix
  for i = 0,nglom-1 for j = 0,nof-1 {
    r = random.repick()
    if (r < 0) {r = 0}
    A.x[i][j] = r
  }

  // Average to obtain similar responses of nearby glomeruli
  blur = 2

  for j = 0,nof-1 {
    X = A.getcol(j)
    for ix = 0,nmitx-1 for iy = 0,nmity-1 {
      S.x[ix][iy] = X.x[ix*nmity+iy]
    }
    for ix = 0,nmitx-1 for iy = 0,nmity-1 {
      X.x[ix*nmity+iy] = 0
      for k = -1,1 for l = -1,1 {
        kx = mod(ix+k,nmitx)
        ly = mod(iy+l,nmity)
        X.x[ix*nmity+iy] += ( S.x[kx][ly] * exp(-blur*sqrt(k^2+l^2)) )
      }
    }
    A.setcol(j,X)
  }

  max = arraymax(A)
  min = arraymin(A)
  print "min, max ",min,max
  for i=0,nglom-1 for j=0,nof-1 {
    A.x[i][j] += -min
  }
  A.muls(1/(max-min))
}


proc read_odour_file() {
  sprint(odourfile,"odour%d",$1)
  ropen(odourfile)
  for i = 0,nof-1 {
    odour.x[i] = fscan()
  }
  ropen()
  printf("Odour %d loaded:\n",$1)
  odour.printf("%6.3f")
}

proc map_odour_to_input() { local i,j // 2 args - odour vector and odour intensity
  X = A.mulv($o1)
  for i = 0, nmitx-1 {
    for j = 0, nmity-1 {
      inputarray.x[i][j] += $2 * X.x[i*nmity+j]
      input[i][j].amp = inputarray.x[i][j]
    }
  }
}

proc add_odour_input() { // 2 args - odour number and input intensity
  generate_odour_matrix()
  read_odour_file($1)
  map_odour_to_input(odour,$2)
}

proc add_fixed_input() { local i,j // 2 args - input vector and input intensity
  sprint(inputfile,"input%d",$1)
  ropen(inputfile)
  for i = 0, nmitx-1 {
    for j = 0, nmity-1 {
      inputarray.x[i][j] = fscan()
      input[i][j].amp = $2*inputarray.x[i][j]
    }
  }
  ropen()
  printf("Input %d loaded:\n",$1)
  inputarray.printf("%6.3f")
}

proc glomshock() { local i,j // 3 args - amplitude, delay and duration
  for i = 0, nmitx-1 {
    for j = 0, nmity-1 {
      inputarray.x[i][j] = $1
      input[i][j].amp = inputarray.x[i][j]
      input[i][j].del = $2
      input[i][j].dur = $3
    }
  }
}