Plots - Two Y-Axis with Different Units

I need to plot a lot of data from an Excel file. I would like to plot one column of data (flow rate) against the left y-axis and have two columns of data (pressure drops) against the right y-axis. How do I do this?

I thought I could work it out using the help pages, but I have no idea how to code the data. I am importing it from Excel and plotting instead. At the moment the plot looks ridiculous because it is plotting it all against the left y-axis and the values for the pressure drops are small compared to the flow rate.

[Rik]

I recovered your deleted content from the Google cache. Deleting content is extremely rude. Please don't do it again.

[Rik]

And again. I bet I'm more stubborn than you, so you might as well give up.

Why do you want your questions to be removed? With the original question people could actually stubble upon your question and find the answer. Now the time Raj spent answering you is wasted. That's not a really effective way of showing gratitude.

[Rik]

Plots - Two Y-Axis with Different Units

I need to plot a lot of data from an Excel file. I would like to plot one column of data (flow rate) against the left y-axis and have two columns of data (pressure drops) against the right y-axis. How do I do this?

I thought I could work it out using the help pages, but I have no idea how to code the data. I am importing it from Excel and plotting instead. At the moment the plot looks ridiculous because it is plotting it all against the left y-axis and the values for the pressure drops are small compared to the flow rate.

[Tony Rankin]

Comment.

[Tony Rankin]

Another comment.

[Tony Rankin]

How about another comment?

Answer 1

[Raj]

Since you have not shared the data, it is not possible to give exact solution to your problem but if you are looking for plotting on both primary (left side) and secondary axis (right side) of a graph, you should use yyaxis command.

See details here:

https://www.mathworks.com/help/matlab/ref/yyaxis.html

Hope this helps!

[Rik]

Deleted comment (which had a csv attached):

I have attached a sample of the data. It is the final three columns that I would like to plot. Not all the values, but a selection of them where it shows a steady state. One is flow rate in litres per minute and the other two are pressure drops in bar.

The link provided was the one I used when I looked for a solution. Although I understand how to code that first plot, I don't know how to input the data from the Excel sheet. That's the reason I thought importing it would be easier. I basically want that but with the data I have. Then I can tweak a little with the editing tool.

[Tony Rankin]

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[Tony Rankin]

Another comment.