Why did I get this error ?

HI all,

I tried to graph the some data using the following loop i'm new to matlab but i think this is almost right. The only thing is i got this error. Anyone have any ideas? Any help would be appreciated thanks!

fieldNames = fieldnames(MCR_full.MIB035.Reaches);
peakArray 
peakArray = 0; 
for k = 1 :3(fieldNames)
    thisFieldName = fieldNames{k};
    thisArray = MCR_full.MIB035.Reaches.(thisFieldName).kin; 
    x = thisArray(:, 1);  
    y = thisArray(:, 3);
    peakArray{k} = findpeaks(y);
    f=figure(k); 
    plot (peakArray{k});
    title(['Peaks for ', thisFieldName]);
end 
grid on;

Unable to perform assignment because brace indexing is not supported for

variables of this type.

Answer 1

[Matt J]

Instead of

peakArray = 0; 

you need,

peakArray = cell(1,numel(fieldNames)); 

[Mackenzie Maher]

Thank you!

[Mackenzie Maher]

So now it has this error

Error using fieldnames

Not enough input arguments.

[Walter Roberson]

peakArray = cell(1,numel(fieldNames)); 

and you should have

for k = 1 : numel(fieldNames)

[Mackenzie Maher]

Got it Thank you so much!