Filter command for contour plot MATLAB

[Alex91]

Hi all,

I have made a BSFC plot in MATLAB with engine data tested on an eddie current dyno, The code I used for it is:

>> NP=40;
>> [RP TP]=meshgrid(linspace(min(RPM),max(RPM),NP),linspace(min(Torque),max(Torqu e),NP));
>> BSFC_IT=griddata(RPM,Torque,BSFC,RP,TP);
>> NC=12;
>> Fig1=figure;
>> [CT HT]=contourf(RP,TP,BSFC_IT,round(logspace(log10(210),log10(400),NC)));
>> colorbar;
>> %clabel(CT,HT);
>> xlabel('Engine Speed (rpm)')
>> ylabel('Torque (Nm)')
>> title('Contours of BSFC (g/kWh)')

With all my data this gave me a contour plot that looks like the image I have attached and this is after fiddling with all of the data to make it look 'pretty'.

I know you can use the filter function to smooth out plots, so my question is, how can I use the filter function to smooth out the curves with the complex code I have?

Any help is much appreciated.

Thanks

Alex

 

[mmwave]

Hello Alex,

Thank you for sharing your BSFC plot and the code you used to create it. It looks like you have already put a lot of effort into making it visually appealing. As for using the filter function to smooth out the curves, there are a few things you can try.

First, you can try applying the filter function directly to the data before plotting it. This would involve replacing the line "BSFC_IT=griddata(RPM,Torque,BSFC,RP,TP);" with something like "BSFC_IT_filtered=filter(1,10,BSFC_IT);" where the numbers "1" and "10" can be adjusted to change the level of smoothing.

Another option is to use the "smoothdata" function in MATLAB. This function allows you to specify the type of smoothing you want (such as moving average or Savitzky-Golay) and the amount of smoothing you want to apply. You can find more information about this function in the MATLAB documentation.

I hope this helps! Let me know if you have any other questions. Good luck with your research.