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Cómo usar el índice de ngfor para obtener el elemento de matriz [índice] en mat-cell

Uso este elemento para un ciclo de todas las columnas en Columnas, el índice no funciona para el valor del iterador de matriz. ¿Cómo hago para que esto funcione?

<ng-container matColumnDef= "{{columnName}}" *ngFor=" let columnName of Columns; index as i"> <th mat-header-cell *matHeaderCellDef>{{columnName == 'Expand' ? '': columnName}} <td mat-cell *matCellDef="let data">{{data.Days[i][columnName]}}

data.Days es una matriz RROR TypeError: no se pueden leer las propiedades de undefined (leyendo ''

about 4 years ago · Juan Pablo Isaza
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