[Qgis-user] Sextante SAGA Grid Calculator - error with negative values

[Michał Bełcik]

Hello everyone!

While executing an algorithm, error appears. I think it has something to do
with negative values in formula.

Here's the execution output log:

SAGA execution console output
_____________________________________________
#####   ##   #####    ##
###     ###  ##       ###
###   # ## ##  #### # ##
### ##### ##    # #####
##### #   ##  ##### #   ##
_____________________________________________

library path:    /usr/lib/saga
library name:    libio_gdal
module name :    GDAL: Import Raster
author      :    (c) 2007 by O.Conrad (A.Ringeler)
_____________________________________________
go...




Parameters




Grids: No objects
Files: "/media/40C3D2430D5AFADF/Working files/Sobibor Forest
District/r_distance.tif"



loading: /media/40C3D2430D5AFADF/Working files/Sobibor Forest
District/r_distance.tif


Driver: ????????????????????aLL/(null)


Cells: x 706, y 676
Bands: 1
Transformation x' = 793760.596036 + x * 50.002653 + y * 0.000000
Transformation y' = 419218.514015 + x * 0.000000 + y * -50.006240

Save grid: /tmp/sextante/1360770554.718.sgrd...

ready

okay
_____________________________________________
#####   ##   #####    ##
###     ###  ##       ###
###   # ## ##  #### # ##
### ##### ##    # #####
##### #   ##  ##### #   ##
_____________________________________________

library path:    /usr/lib/saga
library name:    libgrid_tools
module name :    Resampling
author      :    O.Conrad (c) 2003
_____________________________________________
go...

Load grid: /tmp/sextante/1360770554.718.sgrd...

ready

okay




Parameters




Grid system: 50.002653; 706x 676y; 793785.597363x 385439.299074y
Grid: 1360770554.718
Preserve Data Type: no
Target Grid: user defined


ready

Save grid: /tmp/sextante/1360770554.719.sgrd...

ready

okay
_____________________________________________
#####   ##   #####    ##
###     ###  ##       ###
###   # ## ##  #### # ##
### ##### ##    # #####
##### #   ##  ##### #   ##
_____________________________________________

library path:    /usr/lib/saga
library name:    libio_gdal
module name :    GDAL: Import Raster
author      :    (c) 2007 by O.Conrad (A.Ringeler)
_____________________________________________
go...




Parameters




Grids: No objects
Files: "/media/40C3D2430D5AFADF/Working files/Sobibor Forest
District/habitat_raster1.tif"



loading: /media/40C3D2430D5AFADF/Working files/Sobibor Forest
District/habitat_raster1.tif


Driver: ????????????????????f<iQQ/(null)


Cells: x 25641, y 26751
Bands: 1
Transformation x' = 801166.510000 + x * 1.000007 + y * 0.000000
Transformation y' = 416883.610000 + x * 0.000000 + y * -1.000006

Segmentation fault (core dumped)

error: input file [/tmp/sextante/1360770554.720.sgrd]

error: executing module [Resampling]
_____________________________________________
#####   ##   #####    ##
###     ###  ##       ###
###   # ## ##  #### # ##
### ##### ##    # #####
##### #   ##  ##### #   ##
_____________________________________________

library path:    /usr/lib/saga
library name:    libgrid_tools
module name :    Resampling
author      :    O.Conrad (c) 2003
_____________________________________________
go...

error: Grid file could not be opened.

error: input file [/tmp/sextante/1360770554.721.sgrd]
_____________________________________________
#####   ##   #####    ##
###     ###  ##       ###
###   # ## ##  #### # ##
### ##### ##    # #####
##### #   ##  ##### #   ##
_____________________________________________

library path:    /usr/lib/saga
library name:    libgrid_calculus
module name :    Grid Calculator
author      :    Copyrights (c) 2003 by Andre Ringeler
_____________________________________________
go...

Load grid: /tmp/sextante/1360770554.719.sgrd...

ready

okay

Load grid: /tmp/sextante/1360770554.721.sgrd...

failed




Parameters




Grid system: 50.002653; 707x 677y; 793760.596036x 385414.295954y
Grids: 1 object (1360770554.719))
Result: Result
Formula: (a/1000 * -0.776) + b
Name: C
error: Error in formula
(a/1000 * -0.776) + b
syntax error
Position: 10
(a/1000 *[-]0.776) + b

error: executing module [Grid Calculator]
alculation
Take Formula: no


error: Grid file could not be opened.

error: input file [/tmp/sextante/suitability_SAGA.tif.sgrd]

error: empty input list [GRIDS]

error: executing module [GDAL: Export Raster]
_____________________________________________
#####   ##   #####    ##
###     ###  ##       ###
###   # ## ##  #### # ##
### ##### ##    # #####
##### #   ##  ##### #   ##
_____________________________________________

library path:    /usr/lib/saga
library name:    libio_gdal
module name :    GDAL: Export Raster
author      :    O.Conrad (c) 2007
_____________________________________________
go...

Load grid: /tmp/sextante/suitability_SAGA.tif.sgrd...

failed

Best regards

Michal
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