arrays - Octave/GRASS GIS .mat import error: 'map_data' undefined -


i have matlab script calculates terrain-parameter (describing theoretical shelter , exposure wind) based on digital terrain model. script works both in matlab , octave , yields matrix. now: trying couple grass gis shell script. can call script grass, have problems getting output grass. 1 way use .mat format. problem is, however: when export result of calculation (with save -mat4-binary result.mat ans) , try import .mat file grass, error is:

error: no 'map_data' array found in [...file]

similarly, when load file in octave , try display 

load result.mat  imagesc(map_data), axis equal, axis tight, colorbar

the error

error: `map_data' undefined near line 19 column 9
error: evaluating argument list element number 1

when export matlab, same problem.

where bug?

any appreciated.

the "bug" is, mat-file not contain variable named "map_data", guess variable in mat-file named "ans". use res=load result.mat, struct in mat file. if type in res. autocomplete should list variables inside struct (not sure octave), alternatively use fieldnames(res) list variable names.

/update:

i took short documentation of grass. expects predefined variable names, beginning map_*. instead of 

save -mat4-binary result.mat ans

you should rename variables match documentation , save them using

save -mat4-binary result.mat map_*

-

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