Libraries for computing Symbolic derivative

Hi all! I am searching the Web for some utility libraries that allow to calculate the symbolic second derivative of a N variables function given in input in order to find its critical points. May you suggest me something that may help me? Thanks!

You haven't really specified what you want yet. What kind of functions do you want to differentiate?

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Second for Numpy. The concern with looping seems unwarranted. If anything, you will need much less looping. Case in point, the 1D Haar transform. The first inner for loop has been replaced with a pair of list slices, [0::2] and [1::2]. (Those give the even and odd elements, respectively.)
side note: All the heavy lifting is done with Blas and Lapack, both very fast C math libs. It should not be that much slower than straight C. I really need to do some benchmarking.
Numpy:
def haar1D(vec):
"[(-0.5 to 0.5)] -> [(-0.5 to 0.5)]"
w = len(vec)
while w > 1:
s = (vec[0:w:2] + vec[1:w:2]) / 2.0
d = (vec[0:w:2] - vec[1:w:2]) / 2.0
vec = n.concatenate((s, d, vec[w:]))
w = w / 2
return vec
Compared to the original C code (from http://www.cs.ucf.edu/~mali/haar/):
void haar1d(float *vec, int n)
int i=0;
int w=n;
float *vecp = new float[n];
for(i=0;i<n;i++)
vecp[i] = 0;
while(w>1)
w/=2;
for(i=0;i<w;i++)
vecp[i] = (vec[2*i] + vec[2*i+1])/sqrt(2.0);
vecp[i+w] = (vec[2*i] - vec[2*i+1])/sqrt(2.0);
for(i=0;i<(w*2);i++)
vec[i] = vecp[i];
delete [] vecp;
(I am reasonably certain the whole sqrt(2) thing was a bug. Have not found it in any other literature.)
Last edited by keenerd (2010-05-02 13:18:09)

FTP_CONNECT: User ------- has no access authorization for computer -------.

Hi, could anyone please help me resolve the following issue:
When i run the code below, it comes back saying "could not connect to "host". When tried to run in debug or test the FM "ftp_connect" it says "user ..... has no access authorization for computer .....
REPORT ZALB_FTP_TEST.
types: begin of t_ftp_data,
         line(132) type c,
       end of t_ftp_data.
data: lv_ftp_user(64)                value 'branch'.     "change this
data: lv_ftp_pwd(64)                 value 'careful'. "change this
data: lv_ftp_host(50)                value '10.50.1.199'.     "change this
data: lv_rfc_dest like rscat-rfcdest value 'SAPFTP'.
data: lv_hdl    type i.
data: lv_key    type i               value 26101957.
data: lv_dstlen type i.
data: lt_ftp_data type table of t_ftp_data.
field-symbols: <ls_ftp_data> like line of lt_ftp_data.
*describe field lv_ftp_pwd length lv_dstlen.
lv_dstlen = strlen( lv_ftp_pwd ).
call 'AB_RFC_X_SCRAMBLE_STRING'
id 'SOURCE'      field lv_ftp_pwd
id 'KEY'         field lv_key
id 'SCR'         field 'X'
id 'DESTINATION' field lv_ftp_pwd
id 'DSTLEN'      field lv_dstlen.
call function 'FTP_CONNECT'
exporting
    user            = lv_ftp_user
    password        = lv_ftp_pwd
    host            = lv_ftp_host
    rfc_destination = lv_rfc_dest
importing
    handle          = lv_hdl
exceptions
    not_connected   = 1
    others          = 2.
if sy-subrc ne 0.
write:/ 'could not connect to', lv_ftp_host.
else.
write:/ 'connected successfully. session handle is', lv_hdl.
call function 'FTP_CONNECT'
    exporting
      handle        = lv_hdl
      command       = 'dir'
    tables
      data          = lt_ftp_data
    exceptions
      tcpip_error   = 1
      command_error = 2
      data_error    = 3
      others        = 4.
if sy-subrc ne 0.
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else.
    loop at lt_ftp_data assigning <ls_ftp_data>.
      write: / <ls_ftp_data>.
    endloop.
    call function 'FTP_DISCONNECT'
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        handle = lv_hdl
      exceptions
        others = 1.
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      write:/ 'disconnected from ftp server'.
    endif.
endif.
endif.
Thanks in advance for the help.

It doesn't work for me if I just maintain * entry.
But it works after I maintained specific IP address into the table,
ref notes:2072995 - User has no access authorization for computer
Cause
The message comes after the implementation of note '1605054 - Restriction in access to FTP Servers & usage of test reports' or upgrading to a
support package that contains this note. This note was created to prevent malicious users from accessing remote FTP servers.
Resolution
1. Please ensure that all manual steps from note 1605054 are implemented in your system along with the code corrections
2. Then please enter the allowed FTP servers into the table SAPFTP_SERVERS or enter ‘*’ to allow all FTP servers.

Rfc static libraries for Unicode (Linux)

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Does anybody know if it is possible to use RFC static libraries for Unicode on Linux?
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Libraries for computing Symbolic derivative

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