Running nTop Command Line in Matlab scripts

Daeho Hong

December 09, 2020 18:50

Objective:

Learn how to run your nTop notebook using nTop Command Line (nTopCL) in Matlab scripts.

Procedure:

Prepare the nTop notebook and JSON input for running nTopCL
Matlab Struct data structure can be used to read, modify and write JSON input file.
Run (F5)!
Check if the return messages are printed as below.

[info] Logging Engine started
[info] Login successful[info] Parasolid started
[info] Parasolid started
[info] nTop successfully built.
[info] Logout successful

Feel free to change this script to batch process your workflow by passing input lists in a for loop!

clc,clear,close all

%Provide file paths to nTopCL, nTop file, and output JSON file
%Assuming input and output JSON files as well as .ntop file in the same folder
pathToExe = ['"' 'C:\\Program Files\\nTopology\\nTop Platform\\ntopcl.exe' '"'];
FileToRun='SampleFile.ntop';
OutputFile='output.json';

%Provide a input JSON file
InputFile='input.json';
Inputs = jsondecode(fileread(InputFile));

%Modify input variables
Inputs(1).inputs{2,1}.values = 5;
Inputs(1).inputs{3,1}.values = 3;
Inputs(1).inputs{4,1}.values = 2;

%Write JSON file
JsonStr = jsonencode(Inputs);
JsonStr = strrep(JsonStr, ',', sprintf(',\r'));
JsonStr = strrep(JsonStr, '[{', sprintf('[\r{\r'));
JsonStr = strrep(JsonStr, '}]', sprintf('\r}\r]'));
fid = fopen(InputFile, 'w');
if fid == -1, error('Cannot create JSON file'); end
fwrite(fid, JsonStr, 'char');
fclose(fid);

%Compose a execution command
Arguments=sprintf('%s -j %s -o %s %s', pathToExe,InputFile,OutputFile,FileToRun);
%Run
system(Arguments);

And that’s it! You’ve successfully run nTopCL using Matlab scripts.

Are you still having issues? Contact the support team, and we’ll be happy to help!

Download the Example file:

Keywords:

ntop output ntopcl command line api script matlab input command run code cl lab

Running nTop Command Line in Matlab scripts

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