Open and Write to Files (Obsolete)

ropen()

Python

Syntax:

n.ropen("infile")

n.ropen()

Description:

n.ropen("infile") opens infile for reading. A subsequent n.ropen() with no arguments closes the previously opened infile. A file which is re-opened with ropen(infile) positions the stream at the beginning of the file.

Example:

###########################################
### create a file titled "file.dat" with: #
### 42 13.7                               #
### 14 64.1                               #
### 12 9                                  #
###########################################

from neuron import n

def r_open(ndat):
    n.ropen("file.dat")
    x = []
    y = []
    for i in range(ndat):
        x.append(n.fscan())
        y.append(n.fscan())
    n.ropen()
    return x, y

# ndat is number of data points
ndat = 3
x, y = r_open(ndat)

Diagnostics:: This function returns 0 if the file is not successfully opened.

See also

read, fscan(), getstr(), File

Warning

There is no way to open more than one read file at a time. The same is true for write files.

HOC

Syntax:

ropen("infile")

ropen()

Description:

Ropen() opens infile for reading. A subsequent ropen() with no arguments closes the previously opened infile. A file which is re-opened with ropen(infile) positions the stream at the beginning of the file.

Example:

proc r() {
   ropen("file.dat")
   for (i=0; i<ndat; i=i+1) {
      x[i] = fscan()  y[i]=fscan()
   }
   ropen()
}

Diagnostics:: This function returns 0 if the file is not successfully opened.

See also

read, fscan(), getstr(), File

Warning

There is no way to open more than one read file at a time. The same is true for write files.

wopen()

Python

Syntax:

n.wopen("outfile")

n.wopen()

Description:

n.wopen() is similar to n.ropen() but opens a file for writing. Contents of an already existing outfile are destroyed. Wopened files are written to with fprint(). With no argument, the previously wopened file is closed. n.wopen() returns 0 on failure to open a file.

Example:

from neuron import n

def w_open(ndat, x, y):
    n.wopen("file.dat")
    for i in range(ndat):
        n.fprint(f"{x[i]} {y[i]}\n")
    n.wopen()

# ndat is number of data points
ndat = 3
x = [42.0, 14.0, 12.0]
y = [13.7, 64.1, 9.0]
w_open(ndat, x, y)

See also

fprint(), File()

HOC

Syntax:

wopen("outfile)

wopen()

Description:

Wopen is similar to ropen but opens a file for writing. Contents of an already existing outfile are destroyed. Wopened files are written to with fprint(). With no argument, the previously wopened file is closed. Wopen returns 0 on failure to open a file.

Example:

proc w() {
   wopen("file.dat")
   for (i=0; i<ndat; i=i+1) {
      fprint("%g %g\n", x[i], y[i])
   }
   wopen()
}

See also

fprint(), File()

xopen()

Python

Syntax:

n.xopen("hocfile")

n.xopen("hocfile", "RCSrevision")

Description:

n.xopen() executes the commands in hocfile. This is a convenient way to define user functions and procedures. An optional second argument is the RCS revision number in the form of a string. The RCS file with that revision number is checked out into a temporary file and executed. The temporary file is then removed. A file of the same primary name is unaffected.

HOC

Syntax:

xopen("hocfile")

xopen("hocfile", "RCSrevision")

Description:

Xopen() executes the commands in hocfile. This is a convenient way to define user functions and procedures. An optional second argument is the RCS revision number in the form of a string. The RCS file with that revision number is checked out into a temporary file and executed. The temporary file is then removed. A file of the same primary name is unaffected.

fprint()

Python

Syntax:: n.fprint(format_specifier, ...)

Example:

n.fprint("%g %g\n", x, y)

Description:

Same as printf() but prints to a file opened with wopen(). If no file is opened it prints to the standard output.

HOC

Same as printf() but prints to a file opened with wopen(). If no file is opened it prints to the standard output.