Question

我想创建一个条形图，显示各个国家/地区的喷发数量。但是，提供的数据是字符串，因此我需要遍历数据集以计算各个国家/地区。因为它是字符串格式，所以我很难在循环中提取每个国家/地区的计数数量。我设法使用strcmp进行查找，但是该图不起作用。如何创建一个成功绘制图表的循环？

% Finding each individual country "eachcountry"
eachcountry = unique(thecountry);

% Counting the length of year for j

% loop through each index 
for j = 1:length(thecountry)

  A = strcmp('%s'eachcountry(j),thecountry);

  % Obtaining index of respective country
  indexcountry = find(A)

  numberofcounts =  numel(indexcountry);

  % Plotting with rectangle function, start from the first year, for x axis, 
  % start from 0 for y axis. Width is 1, while frequency is number of
  % counts.
  rectangle('Position',[eachcountry(j) 0 1 numberofcounts])

  hold on
 end

% Labelling axes
xlabel('Country')
ylabel('Frequency')

Answer 1

categorical数据类型用于直接为您提供此行为。您只需要

histogram(categorical(thecountry));

% Labelling axes
xlabel('Country')
ylabel('Frequency')

从字符串绘制条形图

1 个答案: