automaticaly define calibration parameter to the workspace through read the m file

i have a m file, it defineed many calibration parameters one by one, each line seems like following: objDef_CAL('EngDa_jEng_C', '0.197350', 'Min', '0', 'Max', '10', 'Width', '1', 'Typedef', 'j_kgm2_t', 'Rate', 'MED','Description', 'engine inertia'); First question:how to get different part through each line, for example(Name,Min,Max,width...) second: how to define the calibration parameter to worksapce use script.

Answer 1

[Mathieu NOE]

hello

maybe this ?

see my dummy calibration file attached (it's a txt and not a m file)

I simply created a second line with slightly different values (to test the code)

the code : will generate a "out" structure with fields :

out(1) = struct with fields:

EngDa_jEng_C: 0.1973

Min: 0

Max: 10

Width: 1

Typedef: ' j_kgm2_t'

Rate: ' MED'

Description: ' engine inertia'

out(2) = struct with fields:

EngDa_jEng_C: 0.4974

Min: 0

Max: 20

Width: 3

Typedef: ' j_kgm2_t'

Rate: ' MED'

Description: ' engine inertia'

D=readlines('calibration.txt');                                             % read as string array

lines=find(contains(D,'objDef_CAL'));                                       % find the "objDef_CAL" line(s)
k = 0;

for ck=1:numel(lines)   
    tmp = char(D(lines(ck)));
    % remove quote character
    iq = findstr(tmp,'''');
    tmp(iq) = [];
    
    tmp = extractBetween(tmp,'(',')');
    % check if line is empty or not
    if ~isempty(tmp)
        k = k+1;
        s =split(tmp, ',');
        % fill the structure "out" with info's
        out(k).EngDa_jEng_C = str2double(s{2});
        out(k).Min = str2double(s{4});
        out(k).Max = str2double(s{6});
        out(k).Width = str2double(s{8});
        out(k).Typedef = s{10};
        out(k).Rate = s{12};
        out(k).Description = s{14};
    end
end

% let's see what we have
out(1)

out(2)

[wenchao zhang]

thanks, Mathieu, yes i tryed this on my laptop, it works, this information can help me to creat the calibration parameter to the workspace.

[wenchao zhang]

another question, we know s{1} = EngDa_jEng_C, i want implement(EngDa_jEng_C = Simulink.Parameter) in script, how to do?

[Mathieu NOE]

hello

what is "Simulink.Parameter" ? is it a field (and Simulink a structure) ? or just a string or char array ?

[wenchao zhang]

Simulink.Parameter is a command, if i run the command(a =Simulink.Parameter),then a parameter called a will be created,like following:

a =

Parameter with properties:

Value: []

CoderInfo: [1×1 Simulink.CoderInfo]

Description: ''

DataType: 'auto'

Min: []

Max: []

Unit: ''

Complexity: 'real'

Dimensions: [0 0]

now i want to creat a parameter named(EngDa_jEng_C), i want realize this in script(now we know s{1} = 'EngDa_jEng_C'), how to do?

[Mathieu NOE]

I suspect you want to dynamically create a variable named EngDa_jEng_C and assign to it the structure content of Simulink.Parameter ?

I wouldsuggest you to read this :

TUTORIAL: Why Variables Should Not Be Named Dynamically (eval) - MATLAB Answers - MATLAB Central (mathworks.com)

instead , based on the code I suggested above , we can expand it to have the "out" structure have now more fields like :

out.name = 'EngDa_jEng_C

out.param = parameter structure from "Simulink.Parameter"

let's try it (I have run a simulink file of mine and I have this data in my workspace :

a =Simulink.Parameter

a = Parameter with properties:

Value: []

CoderInfo: [1×1 Simulink.CoderInfo]

Description: ''

DataType: 'auto'

Min: []

Max: []

Unit: ''

Complexity: 'real'

Dimensions: [0 0]

now let's try to implement this in the code :

D=readlines('calibration.txt');                                             % read as string array

lines=find(contains(D,'objDef_CAL'));                                       % find the "objDef_CAL" line(s)
k = 0;

for ck=1:numel(lines)   
    tmp = char(D(lines(ck)));
    % remove quote character
    iq = findstr(tmp,'''');
    tmp(iq) = [];
    
    tmp = extractBetween(tmp,'(',')');
    % check if line is empty or not
    if ~isempty(tmp)
        k = k+1;
        s =split(tmp, ',');
        % fill the structure "out" with info's
        out(k).name = s{1};
        out(k).param = Simulink.Parameter;
        out(k).Min = str2double(s{4});
        out(k).Max = str2double(s{6});
        out(k).Width = str2double(s{8});
        out(k).Typedef = s{10};
        out(k).Rate = s{12};
        out(k).Description = s{14};
    end
end

% let's see what we have
out(1)

out(2)

the two out structure will be :

out(1) = struct with fields:

name: 'EngDa_jEng_C'

param: [1×1 Simulink.Parameter]

Min: 0

Max: 10

Width: 1

Typedef: ' j_kgm2_t'

Rate: ' MED'

Description: ' engine inertia'

out(2) = struct with fields:

name: 'EngDa_jEng_C'

param: [1×1 Simulink.Parameter]

Min: 0

Max: 20

Width: 3

Typedef: ' j_kgm2_t'

Rate: ' MED'

Description: ' engine inertia'

and if we look closer into first out fields (out(1).param) we have your Simulink.Parameter datas

out(1).param = Parameter with properties:

Value: []

CoderInfo: [1×1 Simulink.CoderInfo]

Description: ''

DataType: 'auto'

Min: []

Max: []

Unit: ''

Complexity: 'real'

Dimensions: [0 0]

[wenchao zhang]

yes, good idea, then each element of out will have the parameter of(Simulink.Parameter), but if i can directly to see the name(EngDa_jEng_C) in workspace, it will be better, because this is clear, like following,

[Mathieu NOE]

ok, not recommended but you can use assignin for that purpose

see new code below :

D=readlines('calibration.txt');                                             % read as string array

lines=find(contains(D,'objDef_CAL'));                                       % find the "objDef_CAL" line(s)
k = 0;

for ck=1:numel(lines)   
    tmp = char(D(lines(ck)));
    % remove quote character
    iq = findstr(tmp,'''');
    tmp(iq) = [];
    
    tmp = extractBetween(tmp,'(',')');
    % check if line is empty or not
    if ~isempty(tmp)
        k = k+1;
        s =split(tmp, ',');
        % fill the structure "out" with info's
%         out(k).name = s{1};
%         out(k).param = Simulink.Parameter;
        out(k).Min = str2double(s{4});
        out(k).Max = str2double(s{6});
        out(k).Width = str2double(s{8});
        out(k).Typedef = s{10};
        out(k).Rate = s{12};
        out(k).Description = s{14};
        
        % specifically assign "Simulink.Parameter" to s{1} (i.e.var name EngDa_jEng_C)
        assignin ( 'caller', s{1}, Simulink.Parameter );
    end
end

now you have in the workspace a new varaible EngDa_jEng_C (from s{1}) and we have assigned to it the output of Simulink.Parameter

EngDa_jEng_C = Value: []

CoderInfo: [1×1 Simulink.CoderInfo]

Description: ''

DataType: 'auto'

Min: []

Max: []

Unit: ''

Complexity: 'real'

Dimensions: [0 0]

[wenchao zhang]

thanks again, Mathieu.

[Mathieu NOE]

My pleasure !