title: How to make a hierarchal cluster in R between different dataframes?
body: <p>I have 4 different dataframes of for different city's but with the same variables. I want to make a hierarchical cluster between the dataset of the for city's. I have tried this code to make a hierarchical cluster in R:</p>
  
  <pre><code>hc &lt;- hclust(dist(df))
  hcd &lt;- as.dendrogram(hc)
  </code></pre>
  
  <p>But this code makes a dendrogram of one dataframe. What I want to do is to make a dendrogram between different city's, so I want to cluster the row's between different city's. I have searched a lot at the internet bit I couldn't found anything about it. Does anyone know how to solve this problem?</p>
  
  <p>I have also tried to combine the dataset, but then it makes also clusters with the same city's. I want to make clusters between different city's</p>
  
  <p>An example of my dataset is as follows:</p>
  
  <p>I have 4 different dataframes of for different city's but with the same variables. I want to make a hierarchical cluster between the dataset of the for city's. I have tried this code to make a hierarchical cluster in R:</p>
  
  <pre><code>hc &lt;- hclust(dist(df))
  hcd &lt;- as.dendrogram(hc)
  </code></pre>
  
  <p>But this code makes a dendrogram of one dataframe. What I want to do is to make a dendrogram between different city's, so I want to cluster the row's between different city's. I have searched a lot at the internet bit I couldn't found anything about it. Does anyone know how to solve this problem?</p>
  
  <p>I have also tried to combine the dataset, but then it makes also clusters with the same city's. I want to make clusters between different city's</p>
  
  <p>An example of my dataset is as follows:</p>
  
  <pre><code>      colname_city   col_1   col_2
  [1,]  Amsterdam      0.2     0.3
  [2,]  Rotterdam      0.3     0.5
  [3,]  Den Haag       0.4     0.2
  [4,]  Utrecht        0.2     0.1
  [5,]  Amsterdam      0.1     0.5
  [6,]  Rotterdam      0.2     0.5
  [7,]  Rotterdam      0.4     0.4
  [8,]  Utrecht        0.5     0.3
  [9,]  Utrecht        0.5     0.5
  [10,] Den Haag       0.6     0.3
  </code></pre>