Problem Creating a struct within my script in Matlab

Question

I am trying to write a variable into a structure and read it from another existing structure:

struct1.vector = struct2.matrix(:,1);

when I run this line in my script it will create a double variable struct1. Thats why I will get the error:

Unable to perform assignment because dot indexing is not supported for variables of this type.

When I just run the same line in my Command Window it will create a struct variable struct1 just as I want to. Also there are multiple lines, where I try to write into struct1 and some times the first 4 lines work and the 5th doesn't. I don't understand why the script is creating a double, can anybody help me with this?

Help is much appreciated, thank you.

hello and welcome to stackoverflow. please see stackoverflow.com/help/minimal-reproducible-example — Prany
– Prany, Commented Feb 18, 2020 at 15:02

Andrew Janke · Accepted Answer · 2020-02-18 14:51:43Z

3

That probably means that you already have a variable named struct1 in your workspace, either leftover from some previous activity, or assigned earlier in the script.

You can make sure you have a fresh workspace by calling clear before running your script. Better yet, turn your script into a function, and it will have its own workspace.

You can also replace the whole struct1 variable with a new empty struct, to make sure it's of the right type, before assigning to its fields.

struct1 = struct;
struct1.vector = struct2.matrix(:,1);

answered Feb 18, 2020 at 14:51

Andrew Janke

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3 Comments

downbydawn Over a year ago

I just tried it, but the error remains. There is no other struct with the same name.

Cris Luengo Over a year ago

@downbydawn: That's not possible, please post a minimal reproducible example in your question so we can see what exactly you are doing.

downbydawn Over a year ago

I found a variable that was accidentally assigned the same way, changed it and it works now. Thank you!

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