Hey people!
I am using a ramp block in Simulink driven into an m-function. I am checking the signal every time the m-function is executed and sometimes the ramp value is decreasing.
How can be this possible?
Many thanks.
MATLAB: A ramp block going backwards
simulink
Related Solutions
This behavior is a bug that has persisted until R2014a. With the introduction of the HG2 graphics system in R2014b, this issue has since been resolved. Attached is a MAT file with variables that reproduce this issue. The following example uses these variables to generate both incorrect and correct plots from the same code
>> hold on
>> contourf(xksi_mesh,yksi_mesh,strfun);
>> plot(xksi_mesh ,yksi_mesh ,'b');
Incorrect contour plot (R2014a):
Correct contour plot (R2014b):
The workaround to this issue is to use the "fliplr" command to flip all the data from right to left. Doing so yields the correct plot in R2014a and below:
>> hold on
>> contourf(fliplr(xksi_mesh),fliplr(yksi_mesh),fliplr(strfun));
>> plot(xksi_mesh ,yksi_mesh ,'b');
The block does exist in R2010b as well and was part of the Signal Processing Blockset (which has since been repackaged into the DSP System Toolbox). Perhaps you don't have Signal Processing Blockset installed in your R2010b version?
Best Answer