how do I recover lost parts of MATLAB

PORTIONS of MATLAB have disappeared from my PC, presumably having been deleted. I am unable

to edit scripts or execute code.

How do I recover the missing pieces or re-install them, or MATLAB itself? Here are the first few errors

I see when MATLAB boots:

_________________________________________________________________________

Warning: C:\Program Files\MATLAB\R2015b\toolbox\local\pathdef.m not found.

Toolbox Path Cache is not being used. Type 'help toolbox_path_cache' for more info

Undefined function or variable 'ispc'.

Warning: MATLAB did not appear to successfully set the search path. To recover for this session of MATLAB, type "restoredefaultpath;matlabrc". To find out how to avoid this warning the next time you start MATLAB, type "docsearch problem path" after recovering for this session.

Warning: Duplicate directory name: C:\Program Files\MATLAB\R2015b\toolbox\local

Warning: Initializing Java preferences failed in matlabrc.

This indicates a potentially serious problem in your MATLAB setup, which should be resolved as soon as possible. Error detected was:

MATLAB:UndefinedFunction

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

> In matlabrc (line 120)

Warning: Initializing MATLAB Graphics failed.

This indicates a potentially serious problem in your MATLAB setup, which should be resolved as soon as possible. Error detected was:

MATLAB:UndefinedFunction

Undefined function or variable 'ismac'.

> In hgrc (line 145)

In matlabrc (line 126)

Warning: Failed to add default profiler filters.

> In matlabrc (line 135)

Undefined function or variable 'usejava'.

Error in matlabrc (line 189)

if ~(ismcc || isdeployed || feature('isdmlworker')) && usejava('jvm')

[Rik]

I don't know another way to recover these files, so as far as I'm aware uninstalling and the re-installing Matlab would be the easiest solution.

[David Horton]

Thanks!

[David Horton]

Do you know how to re-install if MATLAB was digitally installed?

[Rik]

By downloading the installer from the download center again?

I don't really understand what you mean by digitally in this context.

[David Horton]

I didn't mean digitally! I meant I downloaded MATLAB from MathWorks - I didn't have an installation disk.

So, another poster asked me to supply a list of items in the toolbox/local folder before I re-install, and I did. When I'm ready to re-install, I take it I return to the download center in MathWorks with my license number handy?

[Rik]

I don't believe I have ever had a physical installation medium for Matlab. I always install with the downloaded installer from the site.

[John D'Errico]

Long ago, in a galazy far, far away, we actually had disks to install MATLAB. I recall even a single disk containing the earliest release I had. MATLAB ran from the disk. But that was in the days when memory was measured in kilobytes, not megabytes or more. Gigabyes and even terabytes were things barely imagined.

[David Horton]

LOL. Thanks for this.

[Rik]

Before our department moved to another building a colleague had a manual for the image processing toolbox sitting on his book shelf. I'm not sure which version, but it was at least for prior to R14. Barely from this millennium. I most confess I have only seen pictures of physical Matlab installation media. I expect those things are becoming collector's items.

[David Horton]

I actually had installation disks with my first version of MATLAB. We were actively comparing MATLAB with MATHCAD (I think it was MATHCAD) in those days, to see which better suited us. Obviously, MATLAB won out. But, you're right - that was many moons ago. (I just looked it up - MATHCAD is still around apparently.)

[David Horton]

Oh and, because you mentioned storage capacity, I think both MATLAB & MATHCAD required several disks for installation - maybe even close to 10.

Answer 1

[Steven Lord]

That indicates the MATLAB path has not been set correctly this session. Have you tried what the message told you to try?

Warning: MATLAB did not appear to successfully set the search path. To recover for this session of MATLAB, type "restoredefaultpath;matlabrc". To find out how to avoid this warning the next time you start MATLAB, type "docsearch problem path" after recovering for this session.

[David Horton]

My excuse is, I was tired - or something like that. Seriously though - thanks. I didn't even examine the errors carefully. I will give it a try.

[David Horton]

Unfortunately, this didn't work. I think MATLAB was installed digitally; do you know how to re-install it?

[Steven Lord]

Before you try reinstalling, can you show us what's in the C:\Program Files\MATLAB\R2015b\toolbox\local directory?

[David Horton]

+matlab\

classpath\

ja\

path\

template\

classloader.txt

classpath.txt

Contents.m

CorrectionData.txt

finishdlg.m

finishsav.m

getphlpaths.pl

helperr.html

hgrc.m

initprefs.m

librarypath.txt

license.m

linkerr.html

matlabrc.m

mime.types

printopt.m

restoredefaultpath.m

SetImageTextureSize.m

simulinkrc.m

startpage.m

startupsav.m

TC.xml

TC.xsd

toolbox_path_cache.m

userpath.m

version.m

[David Horton]

BTW, as I mentioned to the other responder (above), I MEANT that I downloaded MATLAB from MathWorks - thus, I don't have an installation disk. But, I do have my license number handy.

[David Horton]

I didn't hear back for a while so, I went ahead and re-installed. No problems doing that but, I did have a problem adding Update 7 (the current last one for R2016b.) I sent the log file to my vendor here. Should I also send the log file to Mathworks? If so, to which email address?

[Steven Lord]

After reading through that directory listing for toolbox/local quickly it looks fine with two exceptions. The first is that it does not contain a pathdef.m file (which is the cause of your MATLAB installation not recognizing many functions.) The second is that it contains a file SetImageTextureSize.m that I don't recognize. Do you know where that came from? If a third party toolbox was writing to toolbox/local it could have accidentally deleted pathdef.m (while trying to manually update it, perhaps?)

If you experienced a problem updating to Update 7 for release R2016b please send the log file to Technical Support using the telephone icon in the upper-right corner of this page. I only see three installation and licensing bugs that exist in release R2016b according to the Bug Reports page and none seem related to just installing an Update release.

[David Horton]

Thanks again. I will send the .log file to Tech Support. FYI, here is the SetImageTextureSize.m script:

function SetImageTextureSize()

oglInfo = opengl('data');

curMaxTexSize = get(groot, 'DefaultImageMaxTextureSize');

if oglInfo.MaxTextureSize < curMaxTexSize

set(groot, 'DefaultImageMaxTextureSize', oglInfo.MaxTextureSize);

end

Currently, this script would have no effect because the "MaxTextureSize" is 16384 and Default is 2048.

I have no idea how pathdef was deleted; there were other files & folders missing also. In any case, thanks for all your help.