CVX Setup Error

1

Hi, I’m trying to use cvx in MATLAB online and I got the following error message. Any help is appreciated:

cvx_setup

CVX: Software for Disciplined Convex Programming (c)2014 CVX Research
Version 2.2, Build 9 (a0a77590) Tue Apr 23 19:28:09 2024

Installation info:
Path: /MATLAB Drive/cvx
MATLAB version: 24.2 (R2024b)
OS: Linux amd64 version 6.8.0-1019-aws
Java version: 1.8.0_292
Verfying CVX directory contents:
WARNING: The following files/directories are missing:
/MATLAB Drive/cvx/lib/@cvxtuple/ + 24 files, 0 subdirectories
These omissions may prevent CVX from operating properly.
WARNING: The following extra files/directories were found:
/MATLAB Drive/cvx/lib/@cvxtuble/ + 24 files, 0 subdirectories
These files may alter the behavior of CVX in unsupported ways.
Preferences:
Path: /MATLAB Drive/.session/default/.matlab/cvx_prefs.mat

Setting CVX paths…done.
Saving updated path…done.
Searching for solvers…5 shims found.
2 solvers initialized (* = default):

  • SDPT3 4.0 {cvx}/sdpt3
    SeDuMi 1.02, {cvx}/sedumi
    3 solvers skipped:
    GLPK
    Could not find a GLPK installation.
    Gurobi unknown
    Could not find a Gurobi MEX file.
    Mosek unknown
    Could not find a MOSEK MEX file.
    Saving updated preferences…done.
    Testing with a simple model…
    UNEXPECTED ERROR: ----------------------------------------------------------------------
    Undefined function ‘cvxtuple’ for input arguments of type ‘struct’.
    Error in cvx_end (line 185)
    assignin( ‘caller’, ‘cvx_optpnt’, cvxtuple( cvx_collapse( vars,
    false, false ) ) );

                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    Error in lorentz (line 100)
    cvx_end
    ^^^^^^^
    Error in cvx/abs (line 68)
    { xt, w } == lorentz( st, 0 ); %#ok
    ^^^^^^^^^^^^^^^^
    Error in cvx/norm (line 56)
    cvx_optval = sum( abs( x ) );
    ^^^^^^^^
    Error in cvx_setup (line 215)
    minimize( norm(A*x-b,1) );
    ^^^^^^^^^^^^^

Please report this error to support, and include entire output of
CVX_SETUP in your support request.

2

I think the warning is self-explanatory. There should be a folder @cvxtuple and instead you have a folder @cvxtuble. I wonder how you were able to arrive at this situation. Probably renaming back should fix it.

1 Like
3

Thanks, yeah, Matlab online doesn’t allow for copying and pasting folders unfortunately, so I was doing it by hand. I found the folder and it fixed the issue.