Bellhop: index exceeds the number of array elements (0)

'Test Scapa Summer' ! TITLE
10.0 ! FREQ (Hz)
1 ! NMEDIA
'SVN' ! SSPOPT (analytic or C-linear interpolation)
51 0.0 260.0 ! DEPTH of bottom (m)
0.0 1498.18 /
10.0 1498.34 /
20.0 1498.51 /
30.0 1498.67 /
40.0 1498.83 /
50.0 1499.00 /
60.0 1499.16 /
70.0 1499.32 /
80.0 1499.49 /
90.0 1499.65 /
100.0 1499.81 /
110.0 1499.98 /
120.0 1500.14 /
130.0 1500.30 /
140.0 1500.47 /
150.0 1500.63 /
160.0 1500.80 /
170.0 1500.96 /
180.0 1501.12 /
190.0 1501.29 /
200.0 1501.45 /
210.0 1501.62 /
220.0 1501.78 /
230.0 1501.94 /
240.0 1502.11 /
250.0 1502.27 /
260.0 1502.43 /
’A’ 0.0
260.0 1600.00 0.0 1.0 /
1 ! NSD
15.0 / ! SD(1:NSD) (m)
51 ! NRD
0.0 220.0 / ! RD(1:NRD) (m)
1001 ! NR
0.0 80.0 / ! R(1:NR ) (km)
’R’ ! ’R/C/I/S’
0 ! NBeams
-20.0 20.0 / ! ALPHA1,2 (degrees)
0.0 250.0 85.0 ! STEP (m), ZBOX (m), RBOX (km)

[Walter Roberson]

Is that BELLHOP from the (third-party) Acoustics Toolbox, https://oalib-acoustics.org/AcousticsToolbox/index_at.html ?

What commands are you using?

[Zoe Haywood]

Yes it is and I used plotssp. This worked on the Munk practice one so I believe I've just got some lines wrong in the env file but not sure which ones. These were the full error messages:

Index exceeds the number of array elements (0).

Error in read_env_core (line 233)

Bdry.Bot.Opt = [ BotOpt( nchars( 1 ) + 1 : nchars(

2 ) - 1 ) blanks( 3 - ( nchars( 2 ) - nchars( 1 ) ) )

];

Error in read_env (line 19)

[ TitleEnv, freq, SSP, Bdry, fid ] = read_env_core(

envfil ); % read in the environmental file

Error in plotssp (line 11)

[ ~, ~, SSP, Bdry, ~, ~, ~, ~, fid ] = read_env(

envfil, 'BELLHOP' );

Answer 1

[Chunru]

Check the quotation marks. AcousticToolbox input use the single quote " ' " for input.

260.0 1502.43 /
’A’ 0.0 
260.0 1600.00 0.0 1.0 /

0.0 80.0 / ! R(1:NR ) (km)
’R’ ! ’R/C/I/S’
0 ! NBeams