Why does plot using contourf take so long to generate and print?

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Peter
Peter 2014-6-18
评论： José-Luis 2014-6-18
I am reading in different files that have 750 x 500 data points. One type is amplitude data of uint8, converted to voltage (double). The other is tof (seconds) of int32. For the int32, I do not need the entire range of data, so I convert it to single and nanoseconds. The time (int32) version takes 4+ mminutes. I'm also not sure why the byte size of the cs array is almost 3 MB. I would have thought it to be half that. Any insight would be greatly appreciated. Below are the command line outputs:
MATLAB Version: 8.2.0.701 (R2013b)
>> read_tof_cscansC
'C:\ODIS_DATA\C9-2ML_7T8\Raw_Brd0_Ml2_THRE.xml'
1.9552 seconds: Read in data and created subplot
123.82 seconds: finished contourf
130.5659 seconds: colorbar
135.1009 seconds: Title
C9-2ML_7T8_THRE.jpg has been saved.
259.0069 seconds: Saved jpg and finished execution
>> clear >> read_cscans_wfmsC
'C:\ODIS_DATA\C9-2ML_7T8\Raw_Brd0_Ml2_PTP.xml'
2.1172 seconds: Read in data and created subplot
13.2042 seconds: finished contourf
14.0325 seconds: colorbar
14.5849 seconds: Title and wfm locations
C9-2ML_7T8.jpg has been saved.
29.4749 seconds: Saved jpg and finished execution
>> clear >> memory
Maximum possible array: 27785 MB (2.914e+10 bytes) *
Memory available for all arrays: 27785 MB (2.914e+10 bytes) *
Memory used by MATLAB: 1131 MB (1.186e+09 bytes)
Physical Memory (RAM): 16374 MB (1.717e+10 bytes)
  • Limited by System Memory (physical + swap file) available.
>>whos cs
Name Size Bytes Class Attributes
cs 499x751 2997992 double
>>

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