---
myst:
    substitutions:
        sentence: "It is performed in the `computeCorrelationMatrix` method."
        bloc:
            python: 3-9
            cpp: 3,6-11
        bloc2:
            python: 11-13
            cpp: 13-15
---

```{include} /../core/dataserver/statistics/correlation_matrix.md
``` 
{{                                                                                                  
    "```{literalinclude} " + parent_dir                                                             
    + "/roottest/uranie/doc/dataserver/statistics/" + language + "/compute_correlation_matrix." 
    + extension + "\n"
    + ":language: " + language + "\n"
    + ":lines: " + bloc[language] + "\n"                                                   
    + "```"                                                                                         
}}  

```none
Computing correlation matrix ...
2x2 matrix is as follows

|      0    |      1    |
-------------------------------
0 |          1      0.9008
1 |     0.9008           1
```

Same thing if computing the correlation matrix on ranks:

{{                                                                                                  
    "```{literalinclude} " + parent_dir                                                             
    + "/roottest/uranie/doc/dataserver/statistics/" + language + "/compute_correlation_matrix." 
    + extension + "\n"
    + ":language: " + language + "\n"
    + ":lines: " + bloc2[language] + "\n"                                                   
    + "```"                                                                                         
}}  

```none
Computing correlation matrix on ranks ...
2x2 matrix is as follows

|      0    |      1    |
-------------------------------
0 |          1      0.7778
1 |     0.7778           1
```

```{toctree}
correlation_matrix/case_vector
```

````{admonition} Summary: Correlation matrix
- `computeCorrelationMatrix` (__const char\*__ varexp="", __const char\*__ select="", __Option_t\*__ 
option="" )

    Compute the correlation matrix on the attributes given by *varexp* applying the filter contained 
    in *select*. When the parameter *varexp* is empty, the correlation matrix is calculated on all the 
    attributes in the {{tds}}.  The filter *select* is added to the 
    [permanent selection](#dataserver_data_pattern_selection) of the {{tds}}. By default, when the 
    *option* is empty, the correlation matrix was calculated on the values (**Pearson matrix**).

    ```{tip}
    The possible values of the argument *option* are:

    **rank**
    : the correlation was calculated on the ranks (**Spearmann matrix**).
    ```
````