Matlabonramp 13.2.

The elseif keyword can be used after if to add more conditions. You can include multiple elseif blocks.

Try adding a variable doDisplay to toggle if the densities are displayed. Add this condition with an elseif block.

I don't really understand or know what to write and what the task wants. What does mean "to toggle" here mean?

This is the furhther practice from the Matlab Onramp course chapter 13

Answer 1

[Cris LaPierre]

"Toggle" means to switch between to states (on/off, yes/no, in/out, show/hide, etc).

A Further Practice section is an area to practice what you have learned. Here, you are provided with a suggestion of what you could do. The suggestion is to replace "else" with "elseif". This creates the opportunity to test a second condition, doDisplay. Follow the same steps you used to create the first condition, doPlot.

[Rola Helwa]

so now my code looks like this 
but how do I toggle densities
I'm sorry but I still don't understand how to do the task


if doPlot==1
    plot(density)
title("Sample Densities")
xticklabels(element)
ylabel("Density (g/cm^3)")
elseif
    doDisplay=
end

[Cris LaPierre]

Follow the same steps you used to create the fist condition.

if doPlot==1
    <your code here>
elseif doDisplay==1
    <you code here>
end

[Ahilan R]

It's still unclear. doDisplay is not defined. So should we define it ourself? or am I not able to understand the task? Anyway I defined it. And it worked. Is this what they actually intended?

doDisplay = randi([0,1])

[Cris LaPierre]

Yes, you will have to create it first (similar to what you did with doPlot) before you can use it in an elseif statement.

[Thiago carneiro]

@Ahilan R it is almost the correct answer. but you are using the matrix notation,i think you must use only a range of integer like do plot. randi[(0 1]). in this case, doDisplay will be toggle only when doPlot==0 and doDisplay==1. All other situations doDisplay will not pop up. I am wrong, somebody correct me, i am a new user.

Answer 2

[Merel Cook]

Now help with 13.2. I am receiving the error code, "are densities displayed when doPlot is 0". What does this error code mean?

[Cris LaPierre]

This isn't an error code. It's feedback. It is a question to ask yourself about the behavior of your code. When the variable doPlot=0, do the densities appear in the plot? Look at the task and determine if they should/shouldn't be appearing and adjust your code accordingly.

[Merel Cook]

Thank you for comment. However, the solution to my problem was that I didn't have the correct spacing bewteen quotation mark when I duplicate the solution ,for 13.2, provided by Matlab. I was able to reseach Matlab's answer because for this particlur problem this seems to be a common problem. I still don't understand why it provides that feedback .statement.

[JAT]

Cris, is there a place we can suggest the tutorial question be reworded for clarification? I didn't understand what the task required either, and from a Google search there are others in the same position. It's been a very clear and understandle onramp tutorial so far - just struggling with this part. Thank you

[Cris LaPierre]

At the top right of the course, there is a question mark icon. Click on that and select "Contact Support".

From there you can create a service request, which allows you to provide suggestions back to MathWorks. Anything you put there will get to the course creator for their consideration. Be sure to be specific on what is causing the confusion.

Remember that for Tasks you can always click "See Solution". Once you understand what the solution is, it would be great if you could share what better wording might be, or what had led you to interpret the question differently than what was intended.

Answer 3

[Mohammad Ali]

if doPlot == 1
 plot(density)
 title("Sample Densities")
 xticklabels(element)
 ylabel("Density (g/cm^3)")
elseif doDisplay == 1
    plot(density)
    title("Sample Densities")
    xticklabels(element)
    ylabel("Density (g/cm^3)") 

else
    disp("The density of " + element ...
+ " is " + density)
end

Answer 4

[Vikas Chelluru]

doPlot = randi([0 1])
doDisplay=randi([0 1]
load datafile
density = data(:,1)
if doPlot == 1
    plot(density)
    title("Sample Densities")
    xticklabels(element)
    ylabel("Density (g/cm^3)")

elseif doDisplay ==1
    
    disp("The density of "+ element+ " is " + density)
end