Use variables as argument parameters inside qsub script - bash

Question

I want to pick up a number of models from a folder and use them in an sge script for an array job. So I do the following in the SGE script:
MODELS=/home/sahil/Codes/bistable/models
numModels=(`ls $MODELS|wc -l`)
echo $numModels
#$ -S /bin/bash
#$ -cwd
#$ -V
#$ -t 1-$[numModels] # Running array job over all files in the models directory.
model=(`ls $MODELS`)
echo "Starting ${model[$SGE_TASK_ID-1]}..."
But I get the following error:
Unable to read script file because of error: Numerical value invalid!
The initial portion of string "$numModels" contains no decimal number
I have also tried to use
#$ -t 1-${numModels}
and
#$ -t 1-(`$numModels`)
but none of these work. Any suggestions/alternate methods are welcome, but they must use the array job functionality of qsub.

Answer 1

Beware that to Bash, #$ -t 1-$[numModels] is nothing more than a comment; hence it does not apply variable expansion to numModels.
One option is to pass the -t argument in the command line: remove it from your script:
#$ -S /bin/bash
#$ -cwd
#$ -V
model=(`ls $MODELS`)
echo "Starting ${model[$SGE_TASK_ID-1]}..."
and submit the script with
MODELS=/home/sahil/Codes/bistable/models qsub -t 1-$(ls $MODELS|wc -l) submit.sh
If you prefer to have a self-contained submission script, another option is to pass the content of the whole script through stdin like this:
#!/bin/bash
qsub <<EOT
MODELS=/home/sahil/Codes/bistable/models
numModels=(`ls $MODELS|wc -l`)
echo $numModels
#$ -S /bin/bash
#$ -cwd
#$ -V
#$ -t 1-$[numModels] # Running array job over all files in the models directory.
model=(`ls $MODELS`)
echo "Starting ${model[$SGE_TASK_ID-1]}..."
EOT
Then you source or execute that script directly to submit your job array (./submit.sh rather than qsub submit.sh as the qsub command is here part of the script.