Matlab coding and workspace

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Nits 2019-6-13

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评论： Nits 2019-6-13

How do I update the value stored in variable in workspace in every iteration while an infinite FOR loop is running in my matlab script?

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madhan ravi 2019-6-13

Why is the for loop infinite? Why not use a while loop nor a condition (break) statement to suffice the loop?

Nits 2019-6-13

Even if I use the while loop, how am I going to get my objective of flashing variable along with value in workspace on every iteration? Because once break command is executed, I can’t go back to the loop again infinite times#live data streaming from camera.

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Answer 1

KSSV 2019-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/466843-matlab-coding-and-workspace#answer_378974

在 MATLAB Online 中打开

A = zeros(100,1) ; % initilaize 
for i = 1:100
A(i) = rand ;    % update the value in loop
end

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Nits 2019-6-13

在 MATLAB Online 中打开

Please find my matlab code below. Here I am trying to get position coordinates of an object in every iteration from camera software. The problem with this code is that I am not able to flash the x,y,z i.e. position coordinates on every iteration rather publishing it once the loop terminates. Since it is live data streaming, I cannot restrict the iteation or loop count here.

Thanks for your time!!

##Code

% function NatNetPollingSample
	fprintf( 'NatNet Polling Sample Start\n' )
	% create an instance of the natnet client class
	fprintf( 'Creating natnet class object\n' )
	natnetclient = natnet;
	% connect the client to the server (multicast over local loopback) -
	% modify for your network
	fprintf( 'Connecting to the server\n' )
	natnetclient.HostIP = '127.0.0.1';
	natnetclient.ClientIP = '127.0.0.1';
	natnetclient.ConnectionType = 'Multicast';
	natnetclient.connect;
	if ( natnetclient.IsConnected == 0 )
		fprintf( 'Client failed to connect\n' )
		fprintf( '\tMake sure the host is connected to the network\n' )
		fprintf( '\tand that the host and client IP addresses are correct\n\n' ) 
		return
	end
	% get the asset descriptions for the asset names
	model = natnetclient.getModelDescription;
	if ( model.RigidBodyCount < 1 )
		return
	end
	% Poll for the rigid body data a regular intervals (~1 sec) for 10 sec.
	fprintf( '\nPrinting rigid body frame data approximately every second for 10 seconds...\n\n' )
   a = [];
   c = [];
   d = [];
	for idx = 1 : 30
		java.lang.Thread.sleep( 996 );
		data = natnetclient.getFrame; % method to get current frame
		
		if (isempty(data.RigidBody(1)))
			fprintf( '\tPacket is empty/stale\n' )
			fprintf( '\tMake sure the server is in Live mode or playing in playback\n\n')
			return
		end
		fprintf( 'Frame:%6d  ' , data.Frame )
		fprintf( 'Time:%0.2f\n' , data.Timestamp )
        
		for i = 1:model.RigidBodyCount
			fprintf( 'Name:"%s"  ', model.RigidBody( i ).Name )
            a=[a data.RigidBody( i ).x * 1000];
            assignin('base','var1',a)
			fprintf( 'X:%0.1fmm  ', data.RigidBody( i ).x * 1000 )
        end
        for i = 1:model.RigidBodyCount
			fprintf( 'Name:"%s"  ', model.RigidBody( i ).Name )
            c=[c data.RigidBody( i ).y * 1000];
            assignin('base','var2',c)
			fprintf( 'Y:%0.1fmm  ', data.RigidBody( i ).y * 1000 )
			
        end
        for i = 1:model.RigidBodyCount
			fprintf( 'Name:"%s"  ', model.RigidBody( i ).Name )
             d=[d data.RigidBody( i ).z * 1000];
             assignin('base','var3',d)
			fprintf( 'Z:%0.1fmm\n', data.RigidBody( i ).z * 1000 )			
        end
       	end 
	disp('NatNet Polling Sample End' ) 

Walter Roberson 2019-6-13

I do not understand what you mean by "flash" in this situation ?

Nits 2019-6-13

I am sorry about that. By flash I mean to publish the variables in workspace.

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