how to save Struct to txt file

hello,

I have my data saved in struct format like this

===

MyData=

1x405 struct array with fields

Distance

Binary

Angle

===

my question is: how to save these cell arrays to text files please?

Answer 1

[Guillaume]

Assuming the fields are scalar, the simplest way is to convert the structure to a table and then use writetable:

writetable(struct2table(MyData), 'somefile.txt')

[Mr. Unkown]

Thanks Guillaume, I have tried this and got undefined function or variable 'struct2table'

[Guillaume]

You must have an old version of matlab then. struct2table has existed since R2013b.

Answer 2

[John Taseff]

google brought me here, updating for future denizens - as of R2020b you can use writestruct

Answer 3

[Adam]

doc fprintf

You will have to put the code together yourself to use fprintf as there is no builtin function that can magically save an arbitrary struct to a text file.

I assume you want to use the file outside of Matlab otherwise just saving to a .mat file would be far better.

[Mr. Unkown]

Thanks Adam, Yes I need to use it outside the Matlab. Can please expand your solution? what do you mean by doc fprintf?

[Adam]

doc fprintf

just takes you to the help page for the function you need to use. There are examples there, but for your own struct you have to work out how to format the text file yourself.

Answer 4

[Rob Campbell]

This might do what you want: https://github.com/ewiger/yamlmatlab

It handles nested structures too. For example, if I define a structure like this:

    settings.main.medFiltRawImage = 5; 
    settings.main.doTiledMerge=true;
    settings.main.tiledMergeThresh=1.05;
    settings.main.secondExpansion=false;
    settings.main.defaultThreshSD=7; 
    settings.mainBin.removeNoise = true; 
    settings.mainBin.medFiltBW = 5;
    settings.mainBin.primaryShape = 'disk';
    settings.mainBin.primaryFiltSize = 50;
    settings.mainBin.expansionShape = 'square';
    settings.mainBin.doExpansion = true;
    settings.mainBin.expansionSize = 600;
    settings.mainGetBB.minSizeInSqMicrons = 15000;
    settings.mergeO.mergeThresh=1.3; 
    settings.stackStr.rescaleTo=50; 
    settings.autoThresh.skipMergeNROIThresh=10;
    settings.autoThresh.doBinaryExpansion=false;
    

Then it will be saved to disk with yaml.WriteYaml whereupon it will look like:

main: {medFiltRawImage: 5.0, doTiledMerge: true, tiledMergeThresh: 1.05, secondExpansion: false,
  defaultThreshSD: 7.0}
mainBin: {removeNoise: true, medFiltBW: 5.0, primaryShape: disk, primaryFiltSize: 50.0,
  expansionShape: square, doExpansion: true, expansionSize: 600.0}
mainGetBB: {minSizeInSqMicrons: 15000.0}
mergeO: {mergeThresh: 1.3}
stackStr: {rescaleTo: 50.0}
autoThresh: {skipMergeNROIThresh: 10.0, doBinaryExpansion: false}