how to plot impulses obtaining x and y values (non periodic) from 2 separate matrices

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Ruben Leon on 12 Nov 2021
Commented: Ruben Leon on 15 Nov 2021
I want to be able to plot x and y data stored in two separate matrices as an impulse graph similar to the image below but not periodic. I know the stem function is used to generate these types of graphs but the difference here is that my data is aperiodic. Any feedback would be much appreciated. Thank you. Ruben Leon on 12 Nov 2021
Sure. These are two (2x3) matrices containg the typy of data I would like to plot.
SpurOffsetFreq = [37.467 56.486 85.159; 56.486 86.693 113.309];
SpurLeveldBc = [-96.527 -97.912 -83.814; -100.779 -84.146 -92.496];
but instead of ploting it using the regular plot function (shown below) which connects each data point (image below) I want to plot an impulse/vector located at each x value going up to its corresponding y value. A noise floor would have to be set lets say at y=-110dBc and so there would be a vector going from -110 to -96.527(y) located at 37.467(x) and so on for all the data points.
figure
hold on
for i = 1:N
plot(SpurOffsetFreq(i,:),SpurLeveldBc(i,:))
end
xlabel('Spur Offset Frequency (KHz)')
ylabel('Spur Level (dBc)') Paul on 13 Nov 2021
Is one of these what you want?
SpurOffsetFreq = [37.467 56.486 85.159; 56.486 86.693 113.309];
SpurLeveldBc = [-96.527 -97.912 -83.814; -100.779 -84.146 -92.496];
% two separate stem plots
figure;
hold on;
for ii = 1:2
stem(SpurOffsetFreq(ii,:),SpurLeveldBc(ii,:),'BaseValue',-110);
end % single stem plot
figure
stem(SpurOffsetFreq(:),SpurLeveldBc(:),'BaseValue',-110) Ruben Leon on 15 Nov 2021
Hi Paul, yes, thats exactly what I need. Thank you! I thought Periodicity was a requirement for using the stem function but I was clearly wrong.

Dave B on 13 Nov 2021
I think you were correct that stem is the correct command. I'm not sure why periodicity factors in, from your description...how about this?
SpurOffsetFreq = [37.467 56.486 85.159; 56.486 86.693 113.309];
SpurLeveldBc = [-96.527 -97.912 -83.814; -100.779 -84.146 -92.496];
% the loop is not necessary when your data are in a matrix
stem(SpurOffsetFreq,SpurLeveldBc,'filled','BaseValue',-110)
xlabel('Spur Offset Frequency (KHz)')
ylabel('Spur Level (dBc)') Ruben Leon on 15 Nov 2021
Thank you Dave.

R2017b

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