> i want see this output:
>
>
> 0 0 0 1710 16
> 0 0 0 2870 16
> 0 0 0 1650 16
>
Here is what I get:
octave:1> A = "0 0 0 1710 16"
A = 0 0 0 1710 16
octave:2> B = "0 0 0 2870 16"
B = 0 0 0 2870 16
octave:3> C = "0 0 0 1650 16"
C = 0 0 0 1650 16
octave:5> save gnuu.txt A -append
octave:6> save gnuu.txt B -append
octave:7> save gnuu.txt C -append
the text file contains:
--------------------------------------
# Created by Octave 5.1.0, Mon Jul 01 17:48:32 2019 GMT <unknown@hostname>
# name: A
# type: string
# elements: 1
# length: 13
0 0 0 1710 16
# name: B
# type: string
# elements: 1
# length: 13
0 0 0 2870 16
# name: C
# type: string
# elements: 1
# length: 13
0 0 0 1650 16
--------------------------
the save command saves the variable information so that a load command can load them back into memory.
it looks like you're using the -ascii option, which is saving the ascii charater values as a single precision matrix. I can recreate that by typing:
save -ascii "gnuu2.txt" A B C
---------------------------------
4.80000000e+01 3.20000000e+01 4.80000000e+01 3.20000000e+01 4.80000000e+01 3.20000000e+01 4.90000000e+01 5.50000000e+01 4.90000000e+01 4.80000000e+01 3.20000000e+01 4.90000000e+01 5.40000000e+01
4.80000000e+01 3.20000000e+01 4.80000000e+01 3.20000000e+01 4.80000000e+01 3.20000000e+01 5.00000000e+01 5.60000000e+01 5.50000000e+01 4.80000000e+01 3.20000000e+01 4.90000000e+01 5.40000000e+01
4.80000000e+01 3.20000000e+01 4.80000000e+01 3.20000000e+01 4.80000000e+01 3.20000000e+01 4.90000000e+01 5.40000000e+01 5.30000000e+01 4.80000000e+01 3.20000000e+01 4.90000000e+01 5.40000000e+01
---------------------------------
to get your desired output, you can first convert your strings to numbers and then use the ascii output option:
>> D = str2num([A;B;C])
D =
0 0 0 1710 16
0 0 0 2870 16
0 0 0 1650 16
octave:17> save -ascii "gnuu2.txt" D
---------------------------------
0.00000000e+00 0.00000000e+00 0.00000000e+00 1.71000000e+03 1.60000000e+01
0.00000000e+00 0.00000000e+00 0.00000000e+00 2.87000000e+03 1.60000000e+01
0.00000000e+00 0.00000000e+00 0.00000000e+00 1.65000000e+03 1.60000000e+01
---------------------------------
if you want them written as integers, you might need to use some of the other file output commands. eg,
> dlmwrite("gnuu3.txt",D," ")
------------------
0 0 0 1710 16
0 0 0 2870 16
0 0 0 1650 16
-------------------