Labview Matlb Call Function
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Dear Robert,
When working with Matlab functions that have multiple output arguments, it is essential to understand how to handle and extract these outputs efficiently. In your case, where you have a function returning two output arguments 's' (displacement) and 'v' (velocity), you can easily capture and utilize these values in your code. Just in case, I am providing an example of how you can handle multiple output arguments in Matlab functions:
function [s, v] = calculateShipValues(t)
% Your calculation logic here
s = % Calculate displacement based on 't'
v = % Calculate velocity based on 't'
end
% Call the function and retrieve the outputs
t = 60; % Assuming 't' is 60 minutes
[s, v] = calculateShipValues(t);
disp(['Displacement (s): ', num2str(s), ' feet']);
disp(['Velocity (v): ', num2str(v), ' feet per second']);
the calculateShipValues function takes 't' as an input and calculates both displacement 's' and velocity 'v'. By calling the function with a specific value of 't', you can retrieve and display the calculated values accordingly.
Regarding cascading multiple Matlab Call Functions to handle multiple output arguments, your approach seems effective. By chaining these functions, you can process the outputs sequentially and achieve the desired results. However, as you mentioned, using a timestamp function to quantify the propagation delay is a good practice to ensure accurate timing measurements.
If you plan to expand to handling more output arguments in the future, cascading the functions as you did with two outputs is a viable approach. Just ensure that the order of execution and data flow between these functions are correctly managed to avoid any issues.
Keep exploring and testing different scenarios to enhance your understanding and optimize your code further.
11 commentaires
Hi Robert,
What are you trying to accomplish exactly in labview, please provide details, so I can guide you to achieve your goal. Are you having trouble executing program in labview?
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3 commentaires
1 commentaire
Hi Robert,
Good catch, however there is alternative approach to resolve this issue without using without using a MATLAB script node if you are up for it, it can be achieved by converting the MATLAB function into a MATLAB DLL (Dynamic Link Library) and then calling this DLL from LabVIEW. This approach allows for seamless integration between the two environments.To convert the calculateShipValues.m MATLAB function into a MATLAB DLL, follow these detailed steps:
First, ensure that the MATLAB function calculateShipValues.m is well-defined and returns the required outputs. The function should have the following structure:
function [s,v] = calculateShipValues(t) s = 5*t.^2 + 90*t - 80; v = 90 - 10*t; disp(['Displacement (s): ', num2str(s), ' feet']); disp(['Velocity (v): ', num2str(v), ' feet per second']); return end
Use MATLAB's mcc command to compile the MATLAB function into a DLL. This command generates a standalone executable or shared library from the MATLAB code. Here is an example of how you can compile the function:
mcc -W lib:calculateShipValues -T link:lib calculateShipValues.m
In LabVIEW, you can use the Call Library Function Node to call functions from DLLs. Follow these steps to call the MATLAB DLL from LabVIEW:
Open LabVIEW and create a new VI.Drag a Call Library Function Node onto the block diagram.Configure the node to call the functions exported by the MATLAB DLL.Pass the input parameters to the function and receive the output values.
By following these steps, you can effectively integrate the MATLAB function calculateShipValues into LabVIEW without using a MATLAB script node. This method ensures efficient communication between MATLAB and LabVIEW, allowing you to leverage the strengths of both environments seamlessly.
veni, vidi, vici
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