How to plot an histogram using ocean script? (monte carlo problem)

Hi all,

I am new using Ocean script and i am having a problem.

I want to do an histogram with the average value of a comparator output (voltage).

However I couldn´t get it yet.

The code i am trying to implement is the following:

ocnWaveformTool( 'wavescan )
simulator( 'spectre )
design(     "/home/user22/simulation/comparator/spectre/schematic/netlist/netlist")
resultsDir( "/home/user22/simulation/comparator/spectre/schematic" )
modelFile(
    '("/opt/ic_tools/pdk/umc130_b06_pb/umc13mmrf/../Models/Spectre/l130e-rf-v171-control.scs" "")
    '("/opt/ic_tools/pdk/umc130_b06_pb/umc13mmrf/../Models/Spectre/L130E_MM_TRIPLEWELL_MAIN_V151.lib.scs" "")
    '("/opt/ic_tools/pdk/umc130_b06_pb/umc13mmrf/../Models/Spectre/l_cr20k_rfvil_V021.lib.scs" "typ")
    '("/opt/ic_tools/pdk/umc130_b06_pb/umc13mmrf/../Models/Spectre/l_nwcr20k_rfvil_V021.lib.scs" "typ")
    '("/opt/ic_tools/pdk/umc130_b06_pb/umc13mmrf/../Models/Spectre/l_sy20k_rfvil_V021.lib.scs" "typ")
    '("/opt/ic_tools/pdk/umc130_b06_pb/umc13mmrf/../Models/Spectre/l_nwsy20k_rfvil_V021.lib.scs" "typ")
    '("/home/user22/CADENCE/UMC130_B06_PB/Monte_Carlo_libs/L130E_statistical_m.scs" "")
    '("/opt/ic_tools/pdk/umc130_b06_pb/umc13mmrf/../Models/Spectre/l_sy20kct_rfvil_V021.lib.scs" "typ")
    '("/opt/ic_tools/pdk/umc130_b06_pb/umc13mmrf/../Models/Spectre/l_nwsy20kct_rfvil_V021.lib.scs" "typ")
    '("/opt/ic_tools/pdk/umc130_b06_pb/umc13mmrf/../Models/Spectre/l_sqsk_rfvil_V021.lib.scs" "typ")
    '("/opt/ic_tools/pdk/umc130_b06_pb/umc13mmrf/../Models/Spectre/l_nwsqsk_rfvil_V021.lib.scs" "typ")
    '("/home/user22/CADENCE/UMC130_B06_PB/Monte_Carlo_libs/L130E_HS12_V231_ma.lib.scs" "tt")
)
analysis('tran ?stop "170u"  )
save( 'v "/out" )
temp( 27 )
monteCarlo( ?numIters "2" ?startIter "1"
    ?analysisVariation 'mismatch ?sweptParam "None"
    ?sweptParamVals "27" ?saveData t
    ?nomRun "yes" ?append nil
    ?saveProcessParams t
)

monteRun()
selectResult('tran)
monteSelectResults()
specLimits ("bw_27" ?upper 15E+06 ?lower 5E+06)
monteExpr( "bw_27" 'average(clip(v("/out" ?result 'tran) 0 85u)))

histogram( "bw_27" ?type 'standard ?numBins '2 ?density 't)

The error is shown bellow:
simulation completed successfully.
 reading simulation data...
       ...successful.
 Monte Carlo Simulation completed successfully...
 ======================================================================
 Statistical Analysis Parameters and Spec Limits:
 
         Parameter        Lower        Upper
 ======================================================================
     noExprs_27       -1e+36       1e+36      
 *Error* eval: not a function - "bw_27"

 *Error* load: error while loading file - "monteCarlo.ocn"

  Can anyone help me please?

Regards

Ricardo Alves