Trying to create a text file with 3000 rows of data and 7 columns.

I want to create a text file with 7 columns titled Time, Ax, Ay, Az, p, q ,r.

Each column should possess 3000 rows of randomnly generated data from the range of 0:2

I have the following code.

Time =  -2 + (2+2)*rand(3000,1);
    Ax =  0 + (2+2)*rand(3000,1);
    Ay = -1 + (2+2)*rand(3000,1);
    Az =  -2 + (2+2)*rand(3000,1);
    p(angular rate along x) =  -2 + (2+2)*rand(3000,1);
    q(angular rate along y) =  -2 + (2+2)*rand(3000,1);
    r(angular rate along z) =  -2 + (2+2)*rand(3000,1);
    
    T = table(Time, Ax, Ay, Az, p, q ,r);
    writetable(T, 'SampleIMUDATA.txt');
    type SampleIMUDATA.txt

Im trying to create this text file in such a way where these numbers are randomnly generated everytime when I run the script, and overwrite the previous contents of the file SampleIMUDATA.txt

When I run the script I get the following error:

>> SampleIMUDATA

Error: File: SampleIMUDATA.m Line: 5 Column: 15

Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other

syntax error. To construct matrices, use brackets instead of parentheses.

I initally thought the dimensions of the 1 by 3000 matrix I was generating were wrong but that doesn't seem wrong so I'm wondering where the error is in dimensions.

Thanks

Answer 1

[Geoff Hayes]

Shivam - what is your intent with this code

    p(angular rate along x) =  -2 + (2+2)*rand(3000,1);
    q(angular rate along y) =  -2 + (2+2)*rand(3000,1);
    r(angular rate along z) =  -2 + (2+2)*rand(3000,1);

Is the above where the error is being generated? I don't understand the use of "angular rate along x". Is this supposed to be a title or something else?

If I remove this text and run just

Time =  -2 + (2+2)*rand(3000,1);
Ax =  0 + (2+2)*rand(3000,1);
Ay = -1 + (2+2)*rand(3000,1);
Az = -2 + (2+2)*rand(3000,1);
p = -2 + (2+2)*rand(3000,1);
q = -2 + (2+2)*rand(3000,1);
r = -2 + (2+2)*rand(3000,1);
T = table(Time, Ax, Ay, Az, p, q ,r);
writetable(T, 'SampleIMUDATA.txt');

then the file is created with seemingly the correct format.

[N/A]

I spent 3 hours working on different codes so I missed that blatant mistake. I was initially trying to comment that p q and r represented angular rates coming in from a gyroscope from x y and z for my knowledge.

This is embarrasing...