salve one field in the same struct is possible?

example:

A.b=3;

A.c=4;

A.d=6;

save("vv",'-struct','A');

A.d=7;

save("vv",'-struct','A','d'); %%don run correctly

%i dont' want resave A.b A.c ..i want only resave A.d

[John D'Errico]

A.d is NOT a struct though. It is just a scalar. And you can trivially save a scalar value. So why do you think you need to ave it as a struct?

[piero]

A is a struct

d is a field of struct

i want to save new value 'd' in struct

struct before modify:

A.b=3

A.c=4

A.d=6

struct after modify:

A.b=3

A.c=4

A.d=7

(but i don't want to resave A.b and A.c because in the code I'm developing the values A.b and A.c can have undergone changes and I just want to save them after pressing a button)

[the cyclist]

For the sake of other folks -- like me! -- who didn't realize this, the syntax

save("vv","-struct","A")

saves all the fields of the structure A as individual variables.

So, the question is whether one can just "append" d to the file, even though A.b and A.c may have changed.

[piero]

here is correct..

but i don't want to add a field 'd' ..i want ro modified on file field 'd' (modifies on file)

Answer 1

[the cyclist]

I believe that

save('vv','-struct','A','d','-append')

will do what you want