Could someone write some code to extract details within a for loop?

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Steve 2019-11-20

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关闭： MATLAB Answer Bot 2021-8-20

In my previous post, I was given some code that works great, but I need to extract some details that are mentioned within one of the for-loops, namely:

arc lengths
arc radii
starting/ending points of arcs (triplet center points)
thetas (w/ corresponding theta1, theta2 angles) for each arc.

Can anyone help me to extract and store these details (along with index/node numbers) within a single variable/file?

Thanks in advance for your help!

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Catalytic 2019-11-20

Mentioned in which for-loop?

Steve 2019-11-20

Thanks for reaching out Catalytic. The for-loop is under: function plotcirc(obj)

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Answer 1

Catalytic 2019-11-21

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编辑：Catalytic 2019-11-21

在 MATLAB Online 中打开

Something like this....

function stuff=getStuff(tgraph,arcNumber)
        AP=tgraph.ArcPoints;
        i=arcNumber;
        
        C1=AP(:,1,i); C2=AP(:,4,i);
        V1=AP(:,2,i); V2=AP(:,3,i);
        
        L=norm(C2-C1);
        U=(C2-C1)/L;
        dV1=(V1-C1)/norm(V1-C1);
        dV2=(V2-C2)/norm(V2-C2);
        
        stuff.theta1=acosd(dot( dV1, U) );
        stuff.theta2=acosd(dot( dV2, -U) );
        stuff.theta=(theta1+theta2)/2;
        stuff.arcradius=norm(C1-C2)/(2*sind(theta));
        stuff.C1=C1;
        stuff.C2=C2;
        stuff.nodeNumber=findedge(tgraph.Cgraph,i);
                
                
end

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Steve 2019-11-21

Catalytic,

The short answer is, Matlab is required for this part of our research.

To address your comment a bit further...

As in any situation when learning something new, one must acquire a "critical mass" of information before becoming self-sustaining. In other words, I won't be a novice forever.

Furthermore, I mentioned to you that I am a Matlab novice so that you would know that I am not at your level of knowledge with Matlab, and so that you would be able to adjust your tutoring approach accordingly.

Back when I was a math/physics tutor (college staff) about 20-25 years ago, the first thing I would always try to find out about my students was the level of knowledge they had on the topic they needed tutoring in. I did this because it set the stage for how I would approach presenting new information to them. For example, I would never drop a differential equation on someone who was having trouble in their algebra-based physics course.

I believe this is the key to effective tutoring, but I find that most tutors don't even realize the importance of this step. Professors teach at their own level--regardless of who is ready to grasp what they are teaching. Tutors, however, need to have more empathy than that, and they must be able to come down to the level of the student. Otherwise, they will be of no help to the student. In any event, thanks for all the help you have provided thus far.

Best,

Steve

Steve 2019-11-22

Thank you Steven. I didn't even know about the MATLAB Onramp tutorial, but I will definitely check it out now that I know about it. Thanks again!

Steve 2019-11-23

By the way Catalytic, thank you for your input. However, I could not get your code/function (shown above) to run, as it was generating errors.

Could someone write some code to extract details within a for loop?

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Could someone write some code to extract details within a for loop?

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