Error using plot Invalid second data argument

Hi,

I am trying to plot a vector (size 690) and I am getting the error listed above (invalid second data argument).

I extracted data from a txt file using the function textscan. I have attached the code I am using below along with the matrix and vector, Aa Rolla. I am relatively new to MATLAB and I would appreciate the help.

%orientation data for sensor a
filename = 'exampleLogfile-000.txt';
fileIDa = fopen(filename);
Aa = textscan(fileIDa, '%s %s %s %s ', 'Headerline', 5);

Rolla = Aa{1,2};
Pitcha = Aa{1,3};
Yawa = Aa{1,4};
i = 1:690;
plot(i, Rolla);

[Takhyung Seon]

I have figured out that Rolla is essentially a cell array and I decided to try plot(i, Rolla{:}); Unfortunately, now I get this error (Error using plot There is no 0.117325 property on the Line class.)

Answer 1

[Walter Roberson]

You are using %s formats to read your data. All of the entries are going to be character vectors. You cannot plot character vectors. Some of those %s need to be %f in the textscan()

[Takhyung Seon]

Thank you so much. I have changed it to %f and plotted my data correctly.

Answer 2

[Roger Stafford]

The variable 'Rolla' needs to be the same size as the 1:690 vector. You can check that by writing "size(Rolla)" in your script.