Hi, I'm trying to find a program line which will make matlab dump numbers that don't respond to an if statement.

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Christopher 2012-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/55271-hi-i-m-trying-to-find-a-program-line-which-will-make-matlab-dump-numbers-that-don-t-respond-to-an-i

            if abs(z(1,end,n)-Z)<=Err
                hold on
                figure(1)
                plot(z(1,:),z(3,:))
                xlabel('x')
                ylabel('y')
                axis ([0 12000 0 10000])
            else
                %Dump, don't plot.

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Christopher 2012-11-30

在 MATLAB Online 中打开

I want simply to stop it from plotting everything, i'll post the code so you can run it.

    function [ ] = lolly()
tInc = input('Input desired timestep (in seconds)');
Z = input('Input desired Landing distance (in meters)');
t(1)=0;
Ang1 = input('First angle of shooting (in degrees)');
Ang2 = input('Last angle of shooting (in degrees)');
AInc = input('Angle increment (also in degrees)');
Err = input('Acceptable Error (in meters)');
w = (Ang2-Ang1)/AInc;
IAng = linspace(Ang1,Ang2,w);
for n=1:w;
        z(:,1,n) = VelocityforAngle(IAng(n));
        i=1;
        while z(3,i,n)>=0;
            i=i+1;
            t(i)=t(i-1)+tInc;
            [z(:,i,n)] = oneStepRK(t(i-1), z(:,i-1,n), tInc);
            if abs(z(1,end,n)-Z)<=Err
                hold on
                figure(1)
                plot(z(1,:),z(3,:))
                xlabel('x')
                ylabel('y')
                axis ([0 12000 0 10000])
            else
            end
        end
end

Walter Roberson 2012-11-30

编辑：Walter Roberson 2012-11-30

You want it to stop all further plots? Or you want it to continue on with the next "n" ? Or you just don't want to plot that one line?

The code you already give will have it skip one line.

Earlier on you assign to z(:,i,n) but in that if you refer to z(1,end,n) which seems to rely upon the fact that you did not pre-allocate z and so "end" refers to the same location as "i". Why not just code as "i", z(1,i,n) and avoid the confusion ?

Why are you referring to z in 3 dimensional form as you calculate it, but in 2 dimensional form when you plot it?

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