Warning: Unsuccessful read: Matching failure in format.

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hi all , i'm getting this error whentrying to read serial data send from arduino in matlab
clear all
close all
clc
% create serial communication object on port COM14
arduin=serial('COM14','BaudRate',9600);
fopen(arduin); % initiate arduino communication
% You must call TIC without an output argument before
% calling TOC without an input argument.
tic;
% data va recevoir le type de mesure
while (toc<=20) % stop after 20 secs
data = fscanf(arduin,'%f');
end
fclose(arduin); % end communication with arduino
thanks

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