Error Message: Undefined function 'BME3202M2F' for input arguments of type 'char'.

I cannot get past this error message:

Undefined function 'BME3202M2F' for input arguments of type 'char'.

Error in lab2_exp2_1 (line 10)

[ AI0Centered9, AI1Centered9, time9 ] = BME3202M2F('exp2.1(9).csv',

gain1, gain2);

The function script, usage script, and each of the csv files are saved within the same directory. I tried adding the csv file path into my code as well, but that produced the same error. I've checked the csv files to rule out any issues with empty or corrupted files.

Function Script:

function [ AI0Centered, AI1Centered, time ] = BME3202M2F(filenameStr, gain1, gain2)

data = readmatrix(filenameStr);

time = data(:,1);
AO0 = data(:,2);
AI0 = data(:,3);
AI1 = data(:,4); 

% AO0_2_5_index = find(AO0 > 2.5, 1); % 5)
% 
% AO0_2_5_time_offset = time(AO0_2_5_index); % 6)
% 
% time = time - AO0_2_5_time_offset; % 7) rescale time
%   
AI0 = AI0 / gain1; % 8) apply 10 v gain

mean_AI0 = mean(AI0(time <= 0)); % 10)
AI0Centered = AI0 - mean_AI0; % 11) center data

AI1 = AI1 / gain2; % 12) repeat for AI1

mean_AI1 = mean(AI1(time <= 0));
AI1Centered = AI1 - mean_AI1;

figure(3); % 13) create plot
plot(time, AI0Centered, 'r-', 'LineWidth', 2);
hold on;
plot(time, AI1Centered, 'b-', 'LineWidth', 2);

xlabel('Time (s)'); % 14)
ylabel('Response (mV)');

legend('AI0Centered', 'AI1Centered'); % 15)

title(['Data from ' filenameStr]); % 16)

filenameStr = strrep(filenameStr, 'CSV', 'PNG'); % 17) csv to png

saveas(gcf, filenameStr, 'png'); % 18) save png plot

Usage Script:

clc, clear

gain1 = 1000;
gain2 = 1000;


% 9 uA

[ AI0Centered9, AI1Centered9, time9 ] = BME3202M2F('exp2.1(9).csv', gain1, gain2); 
AI0Centered9Max = max(AI0Centered9(50:150));
AI0Centered9 = AI0Centered9 * 1000; 

% 10 uA

[ AI0Centered10, AI1Centered10, time10 ] = BME3202M2F('/Users/mgaztambide/Documents/MATLAB/BME 3202/Labs/lab 2/exp2.1(10).csv', gain1, gain2); 
AI0Centered10Max = max(AI0Centered10(50:150));
AI0Centered10 = AI0Centered10 * 1000;

% 15 uA

[ AI0Centered15, AI1Centered15, time15 ] = BME3202M2F('exp2.1(15).csv', gain1, gain2); 
AI0Centered15Max = max(AI0Centered15(50:150));
AI0Centered15 = AI0Centered15 * 1000;

% 18 uA

[ AI0Centered18, AI1Centered18, time18 ] = BME3202M2F('exp2.1(18).csv', gain1, gain2); 
AI0Centered18Max = max(AI0Centered18(50:150));
AI0Centered18 = AI0Centered18 * 1000;

% 20 uA

[ AI0Centered20, AI1Centered20, time20 ] = BME3202M2F('exp2.1(20).csv', gain1, gain2); 
AI0Centered20Max = max(AI0Centered20(50:150));
AI0Centered20 = AI0Centered20 * 1000;

% 23 uA

[ AI0Centered23, AI1Centered23, time23 ] = BME3202M2F('exp2.1(23).csv', gain1, gain2); 
AI0Centered23Max = max(AI0Centered23(50:150));
AI0Centered23 = AI0Centered23 * 1000;

% 27 uA

[ AI0Centered27, AI1Centered27, time27 ] = BME3202M2F('exp2.1(27).csv', gain1, gain2); 
AI0Centered27Max = max(AI0Centered27(50:150));
AI0Centered27 = AI0Centered27 * 1000;

% 30 uA

[ AI0Centered30, AI1Centered30, time30 ] = BME3202M2F('exp2.1(30).csv', gain1, gain2); 
AI0Centered30Max = max(AI0Centered30(50:150));
AI0Centered30 = AI0Centered30 * 1000;

% 33 uA

[ AI0Centered33, AI1Centered33, time33 ] = BME3202M2F('exp2.1(33).csv', gain1, gain2); 
AI0Centered33Max = max(AI0Centered33(50:150));
AI0Centered33 = AI0Centered33 * 1000;

% 36 uA

[ AI0Centered36, AI1Centered36, time36 ] = BME3202M2F('exp2.1(36).csv', gain1, gain2); 
AI0Centered36Max = max(AI0Centered36(50:150));
AI0Centered36 = AI0Centered36 * 1000;

% 39 uA

[ AI0Centered39, AI1Centered39, time39 ] = BME3202M2F('exp2.1(39).csv', gain1, gain2); 
AI0Centered39Max = max(AI0Centered39(50:150));
AI0Centered39 = AI0Centered39 * 1000;

% 40 uA

[ AI0Centered40, AI1Centered40, time40 ] = BME3202M2F('exp2.1(40).csv', gain1, gain2); 
AI0Centered40Max = max(AI0Centered40(50:150));
AI0Centered40 = AI0Centered40 * 1000;

% 45 uA

[ AI0Centered45, AI1Centered45, time45 ] = BME3202M2F('exp2.1(45).csv', gain1, gain2); 
AI0Centered45Max = max(AI0Centered45(50:150));
AI0Centered45 = AI0Centered45 * 1000;

% 47 uA

[ AI0Centered47, AI1Centered47, time47 ] = BME3202M2F('exp2.1(47).csv', gain1, gain2); 
AI0Centered47Max = max(AI0Centered47(50:150));
AI0Centered47 = AI0Centered47 * 1000;

% 49 uA

[ AI0Centered49, AI1Centered49, time49 ] = BME3202M2F('exp2.1(49).csv', gain1, gain2); 
AI0Centered49Max = max(AI0Centered49(50:150));
AI0Centered49 = AI0Centered49 * 1000;



% plot

figure(1); 
plot(time9, AI0Centered9, 'r-', 'LineWidth', 2);
hold on;
plot(time27, AI0Centered27, 'b-', 'LineWidth', 2);
hold on;
plot(time49, AI0Centered49, 'g-', 'LineWidth', 2);

xlabel('Time (ms)', 'FontSize', 12)
ylabel('Response Voltage (V)', 'FontSize', 12)
legend('9 uA', '27 uA', '49 uA', 'FontSize', 12)
title('1.1 Raw Data', 'FontSize', 12)

set(gcf,'Position', [0, 0, 6, 4.5]); 

saveas(gcf, '2_1rawdataplot', 'png'); 

AI0CenteredMax = [AI0Centered9Max, AI0Centered10Max, AI0Centered15Max, AI0Centered18Max, AI0Centered20Max, AI0Centered23Max, AI0Centered27Max, AI0Centered30Max, AI0Centered33Max, AI0Centered36Max, AI0Centered39Max, AI0Centered40Max, AI0Centered45Max, AI0Centered47Max, AI0Centered49Max];
AI0CenteredMax = AI0CenteredMax * 1000; 

inVar = [9,10,15,18,20,23,27,30,33,36,39,40,45,47,49]; 

figure(2); 
plot(inVar, AI0CenteredMax, 'bo-', 'LineWidth', 2); 

xlabel('Stimulation Current (uA)', 'FontSize', 12)
ylabel('Peak Potential (V)', 'FontSize', 12)
title('2.1 Maximum Stimulus Response', 'FontSize', 12)

legend('off')

set(gcf, 'Position', [0, 0, 6, 4.5]); 

saveas(gcf, 'stimresponse.png', 'png'); 

Answer 1

[Image Analyst]

It works for me. Watch:

gain1 = 1000;
gain2 = 1000;
% 9 uA
[ AI0Centered9, AI1Centered9, time9 ] = BME3202M2F('exp2.1(9).csv', gain1, gain2); 

AI0Centered9Max = max(AI0Centered9(50:150));
AI0Centered9 = AI0Centered9 * 1000; 

I think your BME3202M2F.m file is not in the current folder when you run your calling/main script.

After you've run the usage script and gotten the error, tell us what this says in the command window:

>> which -all BME3202M2F

[hyu34gyd5]

It says: 'BME3202M2F' not found.

[Image Analyst]

Then, unlike what you said, the file is NOT in your current directory or on your search path. Look very carefully, including the spelling and capitalization of the function.

[hyu34gyd5]

The Function script shows that it's in the same exact directory as the Usage script and csv files. However, when I run >> path in the command window, an older path is shown for the Function. The function was orignally made and used in a different folder and I dragged it into the new folder I'm using today so I no longer see it saved within the old folder.

[Walter Roberson]

Give the command

rehash

and see if that fixes the problem.

(Note: rehash by itself without further parameters would not be expected to help if the user .m file has been placed into one of MATLAB's installation directories.)

[hyu34gyd5]

I had to remove the current path and add the new one in the command window. Thanks for your help!

[Image Analyst]

I believe the current folder is always checked first, so it should have found it. I believe it would only check the search path if it did not find the m-files in the current folder. So even if the path was totally wrong, or the path had in it a folder where your m-file used to live, it should still find it in the current folder unless you were not really in the current folder you thought you were.

[Walter Roberson]

... or unless your current folder is one of the MATLAB installation folders: the contents of those are cached and the cache is not re-examined unless you ask it to (or until you add or remove software.)