error --> Brace indexing is not supported for variables of this type.

Hi Everyone, I have got this error ''Brace indexing is not supported for variables of this type.'' Actually, I don't know what does mean?

Thanks for your help!

[Stephen23]

@saman zahiri rad: please show the complete error message. This means all of the red text.

[saman zahiri rad]

Thanks for your reply. because of this :

Error in new_report_data (line 1212) label_0 = [GroupingValue_1{g},' =(',num2str(GroupingValue_unique),')'];

[Albrecht Liebenau]

I have the same Problem. can you help me?

Brace indexing is not supported for variables of this type.

Component:Design Optimization | Category:Optimize error

[Walter Roberson]

Albrecht, I think we need more information about your code.

The error message suggests to me you might be using Simulink or Simscape ?

[Albrecht Liebenau]

yeah. im using simscape for a multi body simulation. its a kinematic model of a formula student car.

i have all coordinates in a stucture. is this maybe a problem?

why does the optimization process bring up this fault after a while of simulation and optimizing? its not right away.

could be the reason the solution cannot be found with the adjustments and the scaling factors?

which information do you need?

[Walter Roberson]

I think you will need to use a debugger.

If the line of code giving the error has executed correctly before then what I would look for is the possibility that a variable has become empty.

[Albrecht Liebenau]

thanks for the help.

it was the empty variable.

[bijayini mohanty]

Brace indexing is not supported for variables of this type.

[Walter Roberson]

@bijayini mohanty

Most of the time that has one of a small number of causes:

• there is an existing numeric variable with the same name that you had forgotten existed when you started trying to use the variable as a cell array; or
• you are using a result that would normally be expected to be a cell array, but the particular flow of code happened to return the empty array [] (for example at end of data); or
• misunderstanding of the role of numeric arrays and cell arrays, thinking that you can store a non-scalar object into a numeric array just by using {} indexing; for example A(1:3) = [5 7 9]; A{2} = [2 4] %not valid, cannot pick out one element of a numeric array and make it a cell

[Saravanan]

i have some problems please help

Brace indexing is not supported for variables of this type.

[Walter Roberson]

@Saravanan

You did not post your code and did not attach data, and you did not post information about class() and size() of your data. At this time we can only offer general assistance about what kinds of causes tend to lead to this problem, such as my discussion above at https://www.mathworks.com/matlabcentral/answers/401438-error-brace-indexing-is-not-supported-for-variables-of-this-type#comment_1433699

Answer 1

[Guillaume]

What the error message means is simple, you cannot use {} to index your GroupingValue_1 because for that type of variable, {} indexing has no meaning.

It looks like your code is expecting GroupingVariable to be a cell array. It is not. You'll have to find earlier in your code why that is not the case.

[saman zahiri rad]

Thanks for your answer. :-)

[Jan]

+1. I've removed my redundant answer.

Answer 2

[Jonathan Babitsch]

Hi everybody, I have a similar problem and I have absolutely no clue where my mistake is. I get the same error but I don´t see why. I am a beginner at Matlab from germany sitting on my bachelor thesis. WIthin the project my goal is to check whether the point is sitting in a bounding box. Therefor I check the first box, which is described by the 8 Points on the Matrix M, with all the 8 points of my component. I then move on to the next box and so on. However if I go into the second box, I get the following error:

This is my Code or at least the part I think is relevant:

Please help me as I said I´m just getting started, so it´s possible I misunderstood something completely.

Thanks a lot guys,

Johnny

[Walter Roberson]

You create M{1} and M{2} as containing numeric arrays.

You have

for huellkoerper=1:2
    M=M{huellkoerper};
    stuff
end

The first time you do that, when huellkoerper is 1, you replace the cell array M with the numeric array that was previously stored in M{1} . M is no longer a cell array. Then the next iteration, when huellkoerper you try to access M{2} but M is a numeric array rather than a cell array so that fails.

Inside your for huellkoerper=1:2 loop, you should not have

    M=M{huellkoerper};

and instead where you use M, you should refer to M{huellkoerper};

Answer 3

[Zakaria Aldeeb]

How can I solve this error?

[DGM]

Without knowing what any of the preceding code is or what type of variables these are, I'm going to just guess that maybe you mean q1{i} instead of q{i}

[Zakaria Aldeeb]

I missed this. Looks like I need rest.

thank you