How to print value from Structure in MATLAB

Question

Stephen john 2022-7-4

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编辑： Image Analyst 2022-7-20

matlab.mat

在 MATLAB Online 中打开

Hello Everyone, I hope you are doing well, I have the following Structure which include Prediction and ValueStructure

I want to print the Value from ValueStructure

for Class 1 i have write the following Code.

pred2 = sprintf('Class1 Levels: %d\n Maximum Value of Class1:%d\n Minimum Value of Class1:%d\n',CombineOutput(1).PRFStructure.StagLevels,CombineOutput(1).PRFStructure.StaggMinimumValue,CombineOutput(1).PRFStructure.StaggMaximumValue);

But i am unable to print StagPRFValue. How can i print it.

For Class 2

pred1 = sprintf('Class 2 Levels: %d\n Maximum Value of Class 2:%d\n Minimum Value of Class 2:%d\n ',CombineOutput(2).PRFStructure.Levels,CombineOutput(2).PRFStructure.DSmaximum,CombineOutput(2).PRFStructure.DSminimum);

I want to print unique values of DSPRFValue and DS Length

How can i do that in Matlab

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Answer 1

Jonas 2022-7-4

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编辑：Jonas 2022-7-4

在 MATLAB Online 中打开

you can access the 4 doubles in the cell StagPRFValue by e.g.

CombineOutput(1).ValueStructure.StagPRFValue{1}

the other two values can be accessed with

CombineOutput(2).ValueStructure.DSPRFValue

and

CombineOutput(2).ValueStructure.DSlength

if you want the unique values of those vectors, use unique(CombineOutput(2).ValueStructure.DSlength)

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Jonas 2022-7-4

编辑：Jonas 2022-7-5

在 MATLAB Online 中打开

matlab (1).mat

the provided m file does not have the fieldnames you wrote in your question, e,g, neither of of your two structs of CombineOutput has a field PRFStructure

load('matlab (1).mat','CombineOutput')
CombineOutput(1)
ans = struct with fields:
        Prediction: "Class1"
    ValueStructure: [1×4 table]
CombineOutput(1).ValueStructure
ans = 1×4 table
    StagLevels    StagPRFValue    StaggMinimumValue    StaggMaximumValue
    __________    ____________    _________________    _________________

        4         {4×1 double}          6600                 5400       
CombineOutput(2)
ans = struct with fields:
        Prediction: "Class2"
    ValueStructure: [1×5 table]
CombineOutput(2).ValueStructure
ans = 1×5 table
    DSPRFValue      DSlength      Levels    DSmaximum    DSminimum
    ___________    ___________    ______    _________    _________

    1×15 double    1×15 double      4         5600         4400   

edit: to show that the line DOES work

CombineOutput(1).ValueStructure.StagPRFValue{1}
ans = 4×1
        5400
        5800
        6200
        6600

Jonas 2022-7-5

why does it not work? i edited to previous comment to show, that the syntax is right.

Do you get an error, or did you want another output? please be more specific

Stephen john 2022-7-19

@Jonas i am printing this value in the Textbox in app designer, basically it is not working in that

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Answer 2

Image Analyst 2022-7-19

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Assuming your sprintf worked to put the right string into pred, you can send pred to the text label component on the GUI like this

app.PredEditField.Value = pred; % Send pred string to the label on the GUI.

If you have any more questions, then attach your .mlapp code after you read this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

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Stephen john 2022-7-19

编辑：Stephen john 2022-7-19

在 MATLAB Online 中打开

@Image Analyst here is my .mlapp code in which i am facing problem

The dataset attached above which is matlab file which includes Output name CombineOutput

i want to print StagPRFValue in pred 2.

I want to print unique values of DSPRFValue and DS Length in pred1

when i used the above solution it does not work.

for z = 1:3
    
    pred = sprintf('Cluster %1.0f Predicted PRI: %s\n',z,CombineOutput(z).Prediction);
    app.TextArea.Value{z} = pred;
    switch CombineOutput(z).Prediction
        case  "Class 1"
           
            pred1 = sprintf('Class 2 Levels: %d\n Maximum Value of Class 2:%d\n Minimum Value of Class 2:%d\n ',CombineOutput(z).ValueStructure.Levels,CombineOutput(z).ValueStructure.DSmaximum,CombineOutput(z).ValueStructure.DSminimum);
            app.TextArea_2.Value = pred1;
        case   "Class 2"
            pred2 = sprintf('Class1 Levels: %d\n Maximum Value of Class1:%d\n Minimum Value of Class1:%d\n',CombineOutput(z).ValueStructure.StagLevels,CombineOutput(z).ValueStructure.StaggMinimumValue,CombineOutput(z).ValueStructure.StaggMaximumValue);
            app.TextArea_3.Value = pred2;
    end
end

Image Analyst 2022-7-19

在 MATLAB Online 中打开

StephenJohn.mat

Ok, so you won't attach the .mlapp file with the paperclip icon. We'll see what we can do without it.

Try this:

%s = load('StephenJohn.mat')
%CombineOutput = s.CombineOutput
for z = 1: numel(CombineOutput)
    thisClass = char(CombineOutput(z).Prediction);
    predictedPRI = sprintf('Cluster %1.0f Predicted PRI: "%s".\n',z, thisClass);
    fprintf('For z = %d, %s\n', z, predictedPRI)
    app.TextArea.Value = predictedPRI;
    if contains(thisClass, '1')
        predictedPRI = sprintf('Class1 Levels: %d\n Maximum Value of Class1:%d\n Minimum Value of Class1:%d\n', ...
            CombineOutput(z).ValueStructure.StagLevels, ...
            CombineOutput(z).ValueStructure.StaggMinimumValue, ...
            CombineOutput(z).ValueStructure.StaggMaximumValue);
        app.TextArea_3.Value = predictedPRI;
    elseif contains(thisClass, '2')
        predictedPRI = sprintf('Class 2 Levels: %d\n Maximum Value of Class 2:%d\n Minimum Value of Class 2:%d\n ', ...
            CombineOutput(z).ValueStructure.Levels, ...
            CombineOutput(z).ValueStructure.DSmaximum, ...
            CombineOutput(z).ValueStructure.DSminimum);
        app.TextArea_2.Value = predictedPRI;
    end
end

Image Analyst 2022-7-19

编辑：Image Analyst 2022-7-19

在 MATLAB Online 中打开

StephenJohn.mat

Try this:

s = load('StephenJohn.mat')
s = struct with fields:
    CombineOutput: [1×2 struct]
CombineOutput = s.CombineOutput
CombineOutput = 1×2 struct array with fields:
    Prediction
    ValueStructure
for z = 1: numel(CombineOutput)
    thisClass = char(CombineOutput(z).Prediction);
    predictedPRI = sprintf('Cluster %1.0f Predicted PRI: "%s".\n',z, thisClass);
    fprintf('For z = %d, %s\n', z, predictedPRI)
    app.TextArea.Value = predictedPRI;
    % Get the structure
    str = CombineOutput(z).ValueStructure;
    % Prepare the string.
    if contains(thisClass, '1')
        predictedPRI = sprintf('Class1 Levels: %d\n Maximum Value of Class1:%d\n Minimum Value of Class1:%d\n', ...
            str.StagLevels, ...
            str.StaggMinimumValue, ...
            str.StaggMaximumValue)
        app.TextArea_3.Value = predictedPRI;
    elseif contains(thisClass, '2')
        predictedPRI = sprintf('Class 2 Levels: %d\n Maximum Value of Class 2:%d\n Minimum Value of Class 2:%d\n ', ...
            str.Levels, ...
            str.DSmaximum, ...
            str.DSminimum)
        app.TextArea_2.Value = predictedPRI;
    end
end
For z = 1, Cluster 1 Predicted PRI: "Class1".
predictedPRI = 
    'Class1 Levels: 4
      Maximum Value of Class1:6600
      Minimum Value of Class1:5400
     '
For z = 2, Cluster 2 Predicted PRI: "Class2".
predictedPRI = 
    'Class 2 Levels: 4
      Maximum Value of Class 2:5600
      Minimum Value of Class 2:4400
      '

Image Analyst 2022-7-19

在 MATLAB Online 中打开

StephenJohn.mat

I'm sure you've figured it out by now. You simply add the variable to the sprintf() statement:

s = load('StephenJohn.mat');
CombineOutput = s.CombineOutput;
for z = 1: numel(CombineOutput)
    thisClass = char(CombineOutput(z).Prediction);
    predictedPRI = sprintf('Cluster %1.0f Predicted PRI: "%s".\n',z, thisClass);
    fprintf('For z = %d, %s\n', z, predictedPRI)
    app.TextArea.Value = predictedPRI;
    % Get the table from the structure.  "ValueStructure" is a field of hte structure and it is a table-type variable.
    tbl = CombineOutput(z).ValueStructure;
    % Prepare the string.
	if contains(thisClass, '1')
		StagPRFValues = tbl.StagPRFValue{1};
		predictedPRI = sprintf('Class1 Levels: %d\n StagePRFValues: [%d, %d, %d, %d]\n Maximum Value of Class1:%d\n Minimum Value of Class1:%d\n', ...
			tbl.StagLevels, ...
			StagPRFValues, ...
			tbl.StaggMinimumValue, ...
			tbl.StaggMaximumValue)
		app.TextArea_3.Value = predictedPRI;
	elseif contains(thisClass, '2')
		predictedPRI = sprintf('Class 2 Levels: %d\n Maximum Value of Class 2:%d\n Minimum Value of Class 2:%d\n ', ...
			tbl.Levels, ...
			tbl.DSmaximum, ...
			tbl.DSminimum)
		app.TextArea_2.Value = predictedPRI;
    end
end
For z = 1, Cluster 1 Predicted PRI: "Class1".
predictedPRI = 
    'Class1 Levels: 4
      StagePRFValues: [5400, 5800, 6200, 6600]
      Maximum Value of Class1:6600
      Minimum Value of Class1:5400
     '
For z = 2, Cluster 2 Predicted PRI: "Class2".
predictedPRI = 
    'Class 2 Levels: 4
      Maximum Value of Class 2:5600
      Minimum Value of Class 2:4400
      '

Stephen john 2022-7-20

@Image Analyst and for Class 2 ValueStructure consists of two more variable which is DSPRFValue and and DSlength which should be printed you have not printed that.

in this dataset StagPRFValues have four values but they should not always four they should be changed How can i print that

Image Analyst 2022-7-20

编辑：Image Analyst 2022-7-20

在 MATLAB Online 中打开

StephenJohn.mat

I think you could have figured it out yourself knowing how sprintf() works, but anyway, here is what I got to handle a variable number of elements in the StagPRFValues vector.

s = load('StephenJohn.mat');
CombineOutput = s.CombineOutput;
for z = 1: numel(CombineOutput)
    thisClass = char(CombineOutput(z).Prediction);
    predictedPRI = sprintf('Cluster %1.0f Predicted PRI: "%s".\n',z, thisClass);
    fprintf('For z = %d, %s\n', z, predictedPRI)
    app.TextArea.Value = predictedPRI;
    % Get the table from the structure.  "ValueStructure" is a field of hte structure and it is a table-type variable.
    tbl = CombineOutput(z).ValueStructure;
    % Prepare the string.
    if contains(thisClass, '1')
        predictedPRI = sprintf('Class1 Levels: %d\n\n StagePRFValues: [', tbl.StagLevels);
        StagPRFValues = tbl.StagPRFValue{1};
        numValues = numel(StagPRFValues);
        for k = 1 : numValues
            predictedPRI = sprintf('%s%d ', predictedPRI, StagPRFValues(k));
        end
        predictedPRI = sprintf('%s]\n Maximum Value of Class1:%d\n Minimum Value of Class1:%d\n', ...
            predictedPRI, ...
            tbl.StaggMinimumValue, ...
            tbl.StaggMaximumValue)
        app.TextArea_3.Value = predictedPRI;
    elseif contains(thisClass, '2')
        predictedPRI = sprintf('Class 2 Levels: %d\n Maximum Value of Class 2:%d\n Minimum Value of Class 2:%d\n ', ...
            tbl.Levels, ...
            tbl.DSmaximum, ...
            tbl.DSminimum)
        app.TextArea_2.Value = predictedPRI;
    end
end

I think you should be able to add any additional variables you want to print. If not, see sprintf. If you really can't figure it out based on how I wrote out the other variables, then write back. Otherwise, can you click "Accept this answer."?

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How to print value from Structure in MATLAB

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