In MATLAB grader, how can I make assessments about a plot's marker shape or line width?

In MATLAB grader, how can I make assessments about a plot's marker shape or line width?

I tried the 'keyword is present' option, but it only accepts 'plot'.

I want to check whether my students succeed changing the marker shape and line width.

Is there any method to compare and assess based on what i wrote for reference solution?

It works like this. If a student wrote the exact same code with me, he/she is passed, otherwise not.

Waiting for your advice!!!!

Answer 1

[Mehmed Saad]

I dont have access to matlab grader but i think the following solution may work

add these two lines in your code template (after he plots) and lock them

M_sz = get(findobj(gca,'Type','Line'),'Marker');
L_wd = get(findobj(gca,'Type','Line'),'Linewidth');

then in assessment you can use assessVariableEqual to check Linewidth and marker

[Hyunjee Yoon]

Thanks a lot!!

It was really helpful. Now i can evaluate their ability to change the plot characteristics.

[Mehmed Saad]

Remember that it will work for single children, if there are more than 1 Line children in plot, output will be cell array

for Example

figure,plot(1:10,'Linewidth',5)
hold on,plot(randi([1 10],1,10),'Linewidth',3)

Now if you call

L_wd = get(findobj(gca,'Type','Line'),'Linewidth')

L_wd =

2×1 cell array

{[3]}

{[5]}

so be carefull before creating assessment

[Hyunjee Yoon]

Got it. You're the best!

[Hyunjee Yoon]

I got another question.

How can I get the variables which contain the legend or axis label info????

[Mehmed Saad]

figure,plot(1:10,'linewidth',5,'Marker','diamond')
xlabel('X'),ylabel('Y'),title('Hello World')
legend('x')

Legend

get(gca,'Legend')

then you can access its properties

Axis label

get(gca,'Title')
get(gca,'XLabel')
get(gca,'YLabel')

[Hyunjee Yoon]

One last question!!

how can i get the info about the data?

For example, students submitted plot(A,B), and I want to check if they used correct dataset or not.

Waiting for your help!

[Mehmed Saad]

handle_line = findobj(gca,'Type','Line');
A_ploted = handle_line.XData;
B_ploted = handle_line.YData;

M_sz = handle_line.Marker;
L_wd = handle_line.LineWidth;