f

#### 'Matlab Code' to 'Embedded Matlab fun code'

Dear friends,

I have a Matlab code to process a pure analog signal 'u'. Now I want to implement it in Simulink and I want to use it in 'Embedded Matlab fun block' so i need to transform 'Matlab code' to 'Embedded Matlab fun code' to perform the task.

The Matlab code is as follows:

%%%%%%%%%%%%%%%%%%%%%

u_abs = abs(u);
major_th = 1.5e-1;
minor_th = 1.8e-2;

major_peak_value = [];
minor_peak_value = [];
pos = 1;
pos_max = 1;

while ~isempty(pos)

[m pos_max(end+1)] = max( u_abs( pos : pos + 10) );
pos_max(end) = pos_max(end) + pos - 1;

if m > major_th
major_peak_value(end+1) = m;
else
minor_peak_value(end+1) = m;
end

% exit the peak
pos = find(u_abs(pos:end) < minor_th, 1 , 'first') + pos-1;
% Find the beginning of the next peak
pos = find(u_abs(pos:end) > minor_th, 1 , 'first') + pos-1;
end

pos_max(2) = [];
plot(u); hold on;
plot(pos_max,u(pos_max),'ro');

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

I think i don't need this plot command as I will see the result in the scope directly.

Any suggestion will be very useful.

Thanking you!

Prashant

 0
11/22/2011 11:04:08 AM
comp.soft-sys.matlab 211266 articles. 25 followers. lunamoonmoon (257) is leader.

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"Prashant Sandhi" wrote in message <jafvj8$soq$1@newscl01ah.mathworks.com>...
> Dear friends,
>
>           I have a Matlab code to process a pure analog signal 'u'. Now I want to implement it in Simulink and I want to use it in 'Embedded Matlab fun block' so i need to transform 'Matlab code' to 'Embedded Matlab fun code' to perform the task.
>
>           The Matlab code is as follows:
>
> %%%%%%%%%%%%%%%%%%%%%
>
> u_abs = abs(u);
> major_th = 1.5e-1;
> minor_th = 1.8e-2;
>
> major_peak_value = [];
> minor_peak_value = [];
> pos = 1;
> pos_max = 1;
>

>
>
> while ~isempty(pos)
>
>     [m pos_max(end+1)] = max( u_abs( pos : pos + 10) );
>     pos_max(end) = pos_max(end) + pos - 1;
>
>     if m > major_th
>         major_peak_value(end+1) = m;
>     else
>         minor_peak_value(end+1) = m;
>     end
>
>     % exit the peak
>     pos = find(u_abs(pos:end) < minor_th, 1 , 'first') + pos-1;
>     % Find the beginning of the next peak
> pos = find(u_abs(pos:end) > minor_th, 1 , 'first') + pos-1;
> end
>
> pos_max(2) = [];
> plot(u); hold on;
> plot(pos_max,u(pos_max),'ro');
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>
> I think i don't need this plot command as I will see the result in the scope directly.
>
> Any suggestion will be very useful.
>
> Thanking you!
>
> Prashant

Any one?

Prashant

 0
11/23/2011 9:58:08 AM

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I've got this really cool application that makes a smoothed line using splines, then fits it to a source line using a nonlinear weighting. I'm currently using SciLab with it's 'optim' and 'splin' function to do this, but now I need to write some embeddable C++ code. The 'splin' function is obvious -- it generates a spline from a number of inflection points. The 'optim' function as I am using it uses a quasi-Newton method, which is working just fine for me. Before I go and write this stuff up by hand, does anyone have any suggestions on where I can find example code to do this? I'm mostly concerned with the optimization -- I'd like to get my hands on something where some one else has already fallen into the pitfalls. TIA. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/ "Applied Control Theory for Embedded Systems" came out in April. See details at http://www.wescottdesign.com/actfes/actfes.html Just a remark : there is a lsq_splin function which try to fit a splin to discrete points (with various weight if needed). May be it can help you at least to find a good starting point for your optimization ? hth Bruno Tim Wescott wrote: > I've got this really cool application that makes a smoothed line using > splines, then fits it to a source line using a nonlinear weighting. Is it important that you u...

using '!' in matlab script
It seems unable to invoke the '.EXE' file in the matlab script node. In my matlab code I use '!' to invoke a .exe file, it can be execute in matlab, but when I copy the same code to labview(matlab script node), it does not work the error messages are &nbsp; &nbsp; &nbsp; &nbsp; LabVIEW:&nbsp; Error occurred while executing script. Error message from server: Warning: Name is nonexistent or not a directory: D:\Wastewater_experiment\programCodes\DymolaFiles.&gt; In c:\matlab6p5\toolbox\matlab\general\path.m at line 116&nbsp; In c:\matlab6p5\toolbox\matlab\general\addpath.m at line 88&lt; c:\matlab6p5\bin\win32\dsu.txt created.&nbsp;... Error message from alist Error opening file "dsin.txt": No such file or directory &nbsp;??? Error using ==&gt; loadUnable to read MAT file temp.mat: not a binary MAT file.Try LOAD -ASCII to read as text. Error in ==&gt; C:\dn\programCodes\initload.mOn line 43&nbsp; ==&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; load temp Error in ==&gt; C:\dn\programCodes\operatingPoint.mOn line 17&nbsp; ==&gt; [x_init, x_name] = initload; % loads initial conditions from txt-file 'dsin.txt'. . in labviewmatlab.vi &nbsp; &nbsp; &nbsp; I am sure I have add all the path. and If I just run the code ! alist -a dsin.txt dsintest.mat in matlab script node. There is no errors but it can not be execute. &nbsp; &nbsp; This alist.exe file is f...

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