MATLAB中使用日期字符串数组设置X轴刻度标签绘图的方法及报错解决

Let's work through this issue step by step—first, let's figure out why you're getting that error, then build the correct plot with your date labels.

Why the Error Happens #

The root problem is how you defined your xData array. In MATLAB, when creating a string array, you need to separate individual elements with commas. Your code ["01/22" "01/23"...] doesn't use commas, so MATLAB treats the whole thing as a single concatenated string instead of an array of 8 separate dates. When you pass this single string to plot() alongside your 8-element yData, MATLAB can't resolve the mismatched inputs, hence the "Not enough input arguments" error.

Correct Implementation #

Here's how to properly create your plot with the date labels as X-axis ticks:

1. Fix the date array
   First, define xData correctly as a MATLAB string array (note the commas between elements):

   xData = ["01/22", "01/23", "01/24", "01/25", "01/26", "01/27", "01/28", "01/29"];
   yData = [557 655 941 1433 2118 2927 5578 6167];
   

   Alternatively, you can create it from a cell array of characters:

   xData = string({'01/22','01/23','01/24','01/25','01/26','01/27','01/28','01/29'});
   

2. Plot and set custom X-axis ticks
   Instead of passing the string array directly to plot() (which can cause unexpected behavior with discrete labels), use numerical indices as the X-values, then replace the tick labels with your dates:

   % Plot the data using indices (1 to 8) as X coordinates
   plot(1:length(xData), yData, '-o'); % The '-o' adds markers for clarity (optional)
   
   % Replace X-axis ticks with your date labels
   ax = gca; % Get the current axis handle
   ax.XTick = 1:length(xData); % Set ticks to match each data point
   ax.XTickLabel = xData; % Assign your date strings to the ticks
   
   % Optional: Add labels and title to make the plot clearer
   title('Daily Value Trend');
   xlabel('Date (mm/dd)');
   ylabel('Recorded Value');
   

This approach ensures each data point lines up perfectly with its corresponding date label, and avoids the input mismatch that caused your original error.

内容的提问来源于stack exchange，提问作者livemyaerodream