Code covered by the BSD License  

Highlights from
PIVMat 3.02

image thumbnail

PIVMat 3.02

by

 

27 Apr 2006 (Updated )

A PIV Post-processing and data analysis toolbox

batchf (PIVMat Toolbox)
batchf (PIVMat Toolbox)
PIVMat Function Reference<< Prev | Next >> 
batchf
Execute a function for a series of files

Description
RES = batchf(FILENAME,FUN) executes the function FUN for each file 
matching FILENAME. Wildcards (*) and brackets ([]) may be used (see 
rdir). This is formally equivalent to calling the function FUN 
with the argument loadvec(FILENAME), except that the fields are not 
stored into memory, but are processed from disk one by one by the 
function FUN. This is useful for handling a large number of files 
which cannot be stored into a structure array for lack of memory. All 
the file formats supported by loadvec are also supported by batchf. 
The result RES is an array whose elements are the output of the 
function FUN applied to each file matching FILENAME. 
 
RES = batchf(FILENAME,FUN,ARG) also passes the argument(s) ARG to 
the function FUN. This is formally equivalent as FUN(loadvec(...),ARG) 
(this works only for simple arguments, as strings and numbers, not for 
arrays and cell arrays). 
 
RES = batchf(..., 'nodisp') does not display the function call for 
each file matching FILENAME in the command window. 
 
Examples
 
 
   st=batchf('set*/B00001.VEC','statf') calls the function statf for 
   each file B00001.VEC in each directory matching 'set*'. 
 
   batchf('set*/B*.VEC','showf','rot',8) is equivalent to 
   showf(loadvec('set*/B*.VEC'),'rot',8), except that the files are 
   not stored in a structure array. 
 
If the function FUN to be executed is more complex, you may create a 
M-File called 'myfunction.m', that contains the complex computation to 
be executed for each field V, and to execute RES = 
batchf(FILENAME,'myfunction'). 
 
Example
 Create the following M-File called 'enstrophy.m': 
     function z = enstrophy(v), 
     stat = statf(vec2scal(filterf(v,1),'rot')); 
     z = stat.rms^2; 
Then call: 
     z = batchvec('set*/*.vc7','enstrophy'); 
 
See Also
loadvec, loadarrayvec, rdir. 
 
Published output in the Help browser 
   showdemo batchf 

 Previous: azaverfNext: bwfilterf 

2005-2013 PIVMat Toolbox 3.02

Contact us