how to set a plot to start at zero

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WellsJ 2017-9-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/358533-how-to-set-a-plot-to-start-at-zero

评论： husnir nasyuha 2019-3-27

采纳的回答： KSSV

I am working with gait data and have resampled 1 gait cycle (~120 data points) in to 100 using

[c,d] = size(RawData);

GC_Percent = resample (RawData,100,c);

This seems to work fine but when i plot the data it starts at 1% is there a way to change the output the the first value is plotted at 0 on the y axis?

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Answer 1

KSSV 2017-9-27

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https://ww2.mathworks.cn/matlabcentral/answers/358533-how-to-set-a-plot-to-start-at-zero#answer_283315

Subtract the minimum value (1%) from the data and then plot....

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WellsJ 2017-9-27

apologies if i've misunderstood but that has shifted the data down to the x axis (obviously) i'm looking to shift it left on to the y axis.

Thank you

KSSV 2017-9-27

Try subtracting the minimum y value from y data.

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Answer 2

Jan 2017-9-27

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https://ww2.mathworks.cn/matlabcentral/answers/358533-how-to-set-a-plot-to-start-at-zero#answer_283321

在 MATLAB Online 中打开

The output in the plot does not depend on the Y values, but on the provided x values:

y = rand(10, 10);
subplot(1,2,1);
plot(y)
subplot(1,2,2)
plot(0:9, y)

You posted the code for creating y, but the actual problem appears in the command for plotting, which you did not show.

By the way: resample applied an "antialiasing FIR lowpass filter". It is questionable if tis is really wanted for the analysis of the motion. I prefer a linear interpolation and have written for the same problem: FEX: ScaleTime

Yi = ScaleTime(Y, 100)

Are you sure that you want 100 time steps? Usually 101 steps are used in motion analysis to represent 100 intervals of 1%.

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Jan 2017-9-27

在 MATLAB Online 中打开

I've posted a link to the code already, which solves the problem much faster than interp1. But if you prefer this function:

sY = size(Y, 1);
Yi = interp1(1:sY, Y, linspace(1, sY, 101));

husnir nasyuha 2019-3-27

Hi, may I know what is Y in this code refer to?

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