Unrecognized function or variable 'printstat'. Error in manet (line 162) if printstat == 1

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onye erim 2023-4-29

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https://ww2.mathworks.cn/matlabcentral/answers/1955139-unrecognized-function-or-variable-printstat-error-in-manet-line-162-if-printstat-1

评论： Walter Roberson 2023-4-30

Getting Unrecognized function or variable 'printstat'. error. Please can anyone help? Thanks.

%% print statistics
if printstat == 1
    simstat(ini.globals.SIMTIME,Nodes,ini.globals.SENDERS,ini.globals.RECEIVERS,Protocols,Apps);
end

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Answer 1

albara 2023-4-29

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It looks like you're trying to use the variable printstat in your MATLAB script but it hasn't been defined yet. That's why you are getting the error "Unrecognized function or variable 'printstat'." To fix this error, you need to define the variable printstat before using it in the conditional statement.

For example, if you want to use the printstat variable as a flag to decide whether to print statistics or not, you can set it to 1 (true) or 0 (false). Add the following line before the conditional statement:

printstat = 1; % Set printstat to 1 (true) to print statistics, 0 (false) otherwise

Your updated code should look like this:

printstat = 1; % Set printstat to 1 (true) to print statistics, 0 (false) otherwise

%% print statistics

if printstat == 1

simstat(ini.globals.SIMTIME,Nodes,ini.globals.SENDERS,ini.globals.RECEIVERS,Protocols,Apps);

end

Now your script should run without encountering the "Unrecognized function or variable 'printstat'" error.

Waiting for your feedback

Important: There may be some mistakes in this answer Experts can tell if there are any mistakes

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albara 2023-4-29

The "Unrecognized field name 'SENDERS'" error suggests that the field SENDERS is not defined in the structure ini.globals. You should double-check the ini.globals structure to ensure that the field name is correct and exists.

First, you can display the contents of the ini.globals structure by adding the following line before the %% print statistics section:

disp(ini.globals);

This will show you the structure fields and their corresponding values. Verify if there is a field named SENDERS or if it has a different name. If the field name is different, update your code with the correct field name.

For example, let's say the correct field name is NUM_SENDERS. Your updated code should look like this:

printstat = 1; % Set printstat to 1 (true) to print statistics, 0 (false) otherwise

%% print statistics

if printstat == 1

simstat(ini.globals.SIMTIME,Nodes,ini.globals.NUM_SENDERS,ini.globals.RECEIVERS,Protocols,Apps);

end

If the field SENDERS doesn't exist in the ini.globals structure, you'll need to either define it or find out where it should be coming from. Make sure to carefully review your code or any related documentation to ensure that the correct variable or field name is being used.

albara 2023-4-30

It seems that you are facing two separate issues here:

The missing SENDERS field in ini.globals.
A variable that changes size on every loop iteration, causing the simulation to run slowly.

For the first issue, since SENDERS is not in ini.globals, you should either define it or figure out where it should come from. Please review your code and related documentation to ensure that the correct variable or field name is being used.

For the second issue, the message suggests that a variable's size changes during every loop iteration, which can cause the simulation to run slowly. Preallocating memory for a variable before entering the loop can significantly improve the performance. Here's a general approach to preallocate memory for an array in MATLAB:

Identify the variable that changes size during each loop iteration. Typically, this is an array that grows with each iteration (e.g., result = [result; newValue];).
Estimate the final size of the array (i.e., the size after all iterations).
Preallocate memory for the array before the loop using the zeros or ones function based on the estimated size.
During the loop, update the preallocated array instead of changing its size.

Here's an example of how to preallocate memory for an array:

% Example: Preallocate memory for an array

num_iterations = 1000;

result = zeros(num_iterations, 1); % Preallocate memory for a 1000x1 array

for i = 1:num_iterations

newValue = i^2; % Just an example, replace this with your actual computation

result(i) = newValue; % Update the preallocated array

end

To apply this in your specific case, you'll need to identify the variable that changes size during each iteration and apply the preallocation steps accordingly.

If you're unsure which variable is causing the performance issue, you can use MATLAB's Profiler to identify the slowest parts of your code. To start the Profiler, type profile on before running your script, and profile off after the script finishes. Then, type profile viewer to see the performance report.

Please let me know if you need further assistance with these issues.

Walter Roberson 2023-4-30

在 MATLAB Online 中打开

ini is created by

ini = ini2struct('config.ini')

so the implication is that SENDERS should be part of config.ini

Walter Roberson 2023-4-30

The code expects to use ini.globals.SENDERS but the config.ini file defines SENDERS in the constants section, ini.constants.SENDERS

The config.ini file defines printstats in the visuals section, so the reference should be to ini.visuals.printstats

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Unrecognized function or variable 'printstat'. Error in manet (line 162) if printstat == 1

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