Writing data on a blank figure

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HT 2018-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/386531-writing-data-on-a-blank-figure

编辑： Walter Roberson 2018-3-8

I want to generate a blank figure/image and write a text and variable value using a for loop. For example, writing X:y where X is just a text (which does not change) but value of y is written from a variable and it keeps changing with each iteration. I tried using 'text' but have not got the output i want.

Thanks.

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回答（2 个）

KSSV 2018-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/386531-writing-data-on-a-blank-figure#answer_308544

在 MATLAB Online 中打开

N = 10 ;
figure
hold on
x = 0.5 ;
for i = 1:N
    y = rand ;
    plot(x,y,'.r')
    text(x,y,num2str(i))
end

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HT 2018-3-6

X is a string and y is an array of string too. For example for i=1, display "X = apple" on a blank image where apple will be y(1).

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Walter Roberson 2018-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/386531-writing-data-on-a-blank-figure#answer_308545

text() does that for display purposes. But if you are aiming for an image you would have to capture the axes content with getframe() or saveas() or print() to use text()

If you need an image then the alternative is to use the Computer Vision Toolbox with its insertShape and insertText functions.

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HT 2018-3-8

在 MATLAB Online 中打开

I am getting this error: The length of TEXT must be equal to the number of rows in POSITION. when I do

hf = insertText(hf, [10 10],['X= ', text_str(7)],'FontSize',20,'BoxColor','w');

Walter Roberson 2018-3-8

编辑：Walter Roberson 2018-3-8

Is it possible that text_str is a cell array rather than a character vector or string object ? If so then you would need text_str{7} rather than text_str(7)

This presumes that if text_str is a cell, that text_str{7} only contains a single row of text.

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