diff --git a/src/matrix/matrixAbsoluteMedian.ts b/src/matrix/matrixAbsoluteMedian.ts
index bf326929..ed4a3bea 100644
--- a/src/matrix/matrixAbsoluteMedian.ts
+++ b/src/matrix/matrixAbsoluteMedian.ts
@@ -1,4 +1,5 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
+
 import { xMedian } from '../x/index.ts';
 
 /**
diff --git a/src/matrix/matrixAutoCorrelation.ts b/src/matrix/matrixAutoCorrelation.ts
index baaad2aa..33c4bfbe 100644
--- a/src/matrix/matrixAutoCorrelation.ts
+++ b/src/matrix/matrixAutoCorrelation.ts
@@ -1,4 +1,5 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
+
 import { xCorrelation } from '../x/index.ts';
 
 export function matrixAutoCorrelation(
diff --git a/src/matrix/matrixBoxPlot.ts b/src/matrix/matrixBoxPlot.ts
index 8597614d..888d43b7 100644
--- a/src/matrix/matrixBoxPlot.ts
+++ b/src/matrix/matrixBoxPlot.ts
@@ -1,6 +1,4 @@
-import type { DoubleArray } from 'cheminfo-types';
-
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleArray, DoubleMatrix } from 'cheminfo-types';
 
 export interface MatrixBoxPlot {
   q1: Float64Array;
diff --git a/src/matrix/matrixCenterZMean.ts b/src/matrix/matrixCenterZMean.ts
index f4ce22b1..61a41b31 100644
--- a/src/matrix/matrixCenterZMean.ts
+++ b/src/matrix/matrixCenterZMean.ts
@@ -1,4 +1,4 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
 
 import { matrixCreateEmpty } from './matrixCreateEmpty.ts';
 
diff --git a/src/matrix/matrixCheck.ts b/src/matrix/matrixCheck.ts
index 59e89b21..44b77b52 100644
--- a/src/matrix/matrixCheck.ts
+++ b/src/matrix/matrixCheck.ts
@@ -1,4 +1,4 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
 
 export function matrixCheck(data: DoubleMatrix): void {
   if (data.length === 0 || data[0].length === 0) {
diff --git a/src/matrix/matrixCheckRanges.ts b/src/matrix/matrixCheckRanges.ts
index a82f8b8b..bb1b1b66 100644
--- a/src/matrix/matrixCheckRanges.ts
+++ b/src/matrix/matrixCheckRanges.ts
@@ -1,4 +1,4 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
 
 export interface SubmatrixBoundaries {
   /**
diff --git a/src/matrix/matrixColumnsCorrelation.ts b/src/matrix/matrixColumnsCorrelation.ts
index ff1f60c6..bcda9ff1 100644
--- a/src/matrix/matrixColumnsCorrelation.ts
+++ b/src/matrix/matrixColumnsCorrelation.ts
@@ -1,6 +1,6 @@
+import type { DoubleMatrix } from 'cheminfo-types';
 import { Matrix } from 'ml-matrix';
 
-import type { DoubleMatrix } from '../types/index.ts';
 import { xCorrelation } from '../x/index.ts';
 
 /**
diff --git a/src/matrix/matrixCreateEmpty.ts b/src/matrix/matrixCreateEmpty.ts
index ca5cfa62..07658edd 100644
--- a/src/matrix/matrixCreateEmpty.ts
+++ b/src/matrix/matrixCreateEmpty.ts
@@ -1,4 +1,5 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
+
 import type {
   NumberArrayConstructor,
   NumberArrayType,
diff --git a/src/matrix/matrixHistogram.ts b/src/matrix/matrixHistogram.ts
index e3cedc39..18e1ff69 100644
--- a/src/matrix/matrixHistogram.ts
+++ b/src/matrix/matrixHistogram.ts
@@ -1,6 +1,5 @@
-import type { DataXY } from 'cheminfo-types';
+import type { DataXY, DoubleMatrix } from 'cheminfo-types';
 
-import type { DoubleMatrix } from '../types/index.js';
 import type { XHistogramOptions } from '../x/index.ts';
 import { xHistogram } from '../x/index.ts';
 
diff --git a/src/matrix/matrixMedian.ts b/src/matrix/matrixMedian.ts
index dc9799f2..260330ee 100644
--- a/src/matrix/matrixMedian.ts
+++ b/src/matrix/matrixMedian.ts
@@ -1,4 +1,5 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
+
 import { xMedian } from '../x/index.ts';
 
 import { matrixToArray } from './matrixToArray.ts';
diff --git a/src/matrix/matrixMinMaxAbsoluteZ.ts b/src/matrix/matrixMinMaxAbsoluteZ.ts
index a465fb53..2afd0d1d 100644
--- a/src/matrix/matrixMinMaxAbsoluteZ.ts
+++ b/src/matrix/matrixMinMaxAbsoluteZ.ts
@@ -1,5 +1,4 @@
-import type { DoubleMatrix } from '../types/index.ts';
-
+import type { DoubleMatrix } from 'cheminfo-types';
 /**
  * Get min and max of the absolute values of Z.
  * @param matrix - matrix [rows][cols].
diff --git a/src/matrix/matrixMinMaxZ.ts b/src/matrix/matrixMinMaxZ.ts
index ff088486..86af06eb 100644
--- a/src/matrix/matrixMinMaxZ.ts
+++ b/src/matrix/matrixMinMaxZ.ts
@@ -1,4 +1,4 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
 
 import { matrixCheck } from './matrixCheck.ts';
 
diff --git a/src/matrix/matrixNoiseStandardDeviation.ts b/src/matrix/matrixNoiseStandardDeviation.ts
index 94cfcce9..c68012a0 100644
--- a/src/matrix/matrixNoiseStandardDeviation.ts
+++ b/src/matrix/matrixNoiseStandardDeviation.ts
@@ -1,4 +1,5 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
+
 import { xNoiseStandardDeviation } from '../x/index.ts';
 
 import { matrixToArray } from './matrixToArray.ts';
diff --git a/src/matrix/matrixPQN.ts b/src/matrix/matrixPQN.ts
index ddf3061b..f72cfa20 100644
--- a/src/matrix/matrixPQN.ts
+++ b/src/matrix/matrixPQN.ts
@@ -1,6 +1,6 @@
+import type { DoubleMatrix } from 'cheminfo-types';
 import { Matrix } from 'ml-matrix';
 
-import type { DoubleMatrix } from '../types/index.ts';
 import { xMedian } from '../x/index.ts';
 
 export interface MatrixPQNOptions {
diff --git a/src/matrix/matrixSetSubMatrix.ts b/src/matrix/matrixSetSubMatrix.ts
index 8a3f2f93..9ddd7b11 100644
--- a/src/matrix/matrixSetSubMatrix.ts
+++ b/src/matrix/matrixSetSubMatrix.ts
@@ -1,4 +1,4 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
 
 import { matrixCheckRanges } from './matrixCheckRanges.ts';
 
diff --git a/src/matrix/matrixToArray.ts b/src/matrix/matrixToArray.ts
index 12218aef..7bb3be8e 100644
--- a/src/matrix/matrixToArray.ts
+++ b/src/matrix/matrixToArray.ts
@@ -1,4 +1,4 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
 
 import { matrixCheck } from './matrixCheck.ts';
 
diff --git a/src/matrix/matrixZRescale.ts b/src/matrix/matrixZRescale.ts
index 3f8a88bb..f510127b 100644
--- a/src/matrix/matrixZRescale.ts
+++ b/src/matrix/matrixZRescale.ts
@@ -1,4 +1,5 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
+
 import type {
   DoubleArrayConstructor,
   DoubleArrayType,
diff --git a/src/matrix/matrixZRescalePerColumn.ts b/src/matrix/matrixZRescalePerColumn.ts
index 1e9c856e..64d1562d 100644
--- a/src/matrix/matrixZRescalePerColumn.ts
+++ b/src/matrix/matrixZRescalePerColumn.ts
@@ -1,4 +1,4 @@
-import type { DoubleMatrix } from '../types/index.ts';
+import type { DoubleMatrix } from 'cheminfo-types';
 
 import { matrixCreateEmpty } from './matrixCreateEmpty.ts';
 
diff --git a/src/types/DoubleMatrix.ts b/src/types/DoubleMatrix.ts
deleted file mode 100644
index 249029e7..00000000
--- a/src/types/DoubleMatrix.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-import type { DoubleArray } from 'cheminfo-types';
-
-export type DoubleMatrix = DoubleArray[];
diff --git a/src/types/index.ts b/src/types/index.ts
index 4ce9fea3..7cf638b2 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -1,4 +1,3 @@
 export * from './DataReIm.ts';
 export * from './DataXReIm.ts';
-export * from './DoubleMatrix.ts';
 export * from './Point.ts';