---
title: "ClikaRT::tables::Table::ColumnRef"
sidebar_label: "Table::ColumnRef"
description: "The handle returned by frame[name]. Compound ops mutate the live column (the scalar broadcasts); = tensor creates or replaces the column."
---

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**Header:** `ClikaRT/tables/table.h`

The handle returned by `frame[name]`. Compound ops mutate the live column (the scalar broadcasts); `= tensor` creates or replaces the column. On a failure (missing column, non-numeric, length mismatch) the op raises [`ClikaRT::Error`](../Error.md) in your translation unit, in BOTH library modes: a chaining operator returns `*this` and cannot carry a [`Result`](../Result.md), so this block is the documented mode-invariant throwing surface. [`pow`](./Table.ColumnRef.md#pow-2) / [`floordiv`](./Table.ColumnRef.md#floordiv-2) are methods (C++ has no `**` / `//`).

## Column right-hand side

### operator+=(Tensor) {#operator-plus-assign}

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`ColumnRef&` **`operator+=`**(`const` [`Tensor`](../Tensor.md)`&` `other`)

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Declared in `ClikaRT/tables/table.h`, line 284

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### operator-=(Tensor) {#operator-minus-assign}

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`ColumnRef&` **`operator-=`**(`const` [`Tensor`](../Tensor.md)`&` `other`)

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Subtract another column elementwise, in place.

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Declared in `ClikaRT/tables/table.h`, line 286

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### operator\*=(Tensor) {#operator-mul-assign}

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`ColumnRef&` **`operator*=`**(`const` [`Tensor`](../Tensor.md)`&` `other`)

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Multiply by another column elementwise, in place.

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Declared in `ClikaRT/tables/table.h`, line 288

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### operator/=(Tensor) {#operator-div-assign}

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`ColumnRef&` **`operator/=`**(`const` [`Tensor`](../Tensor.md)`&` `other`)

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Divide by another column elementwise, in place.

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Declared in `ClikaRT/tables/table.h`, line 290

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### operator%=(Tensor) {#operator-mod-assign}

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`ColumnRef&` **`operator%=`**(`const` [`Tensor`](../Tensor.md)`&` `other`)

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Elementwise modulo by another column, in place.

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Declared in `ClikaRT/tables/table.h`, line 292

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### pow(Tensor) {#pow}

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`ColumnRef&` **`pow`**(`const` [`Tensor`](../Tensor.md)`&` `other`)

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Raise to another column's elementwise powers, in place.

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Declared in `ClikaRT/tables/table.h`, line 294

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### floordiv(Tensor) {#floordiv}

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`ColumnRef&` **`floordiv`**(`const` [`Tensor`](../Tensor.md)`&` `other`)

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Floor-divide by another column elementwise, in place.

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Declared in `ClikaRT/tables/table.h`, line 296

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## Member functions

### operator+=(double) {#operator-plus-assign-2}

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`ColumnRef&` **`operator+=`**(`double` `scalar`)

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Add `scalar` to every element of the column, in place.

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Declared in `ClikaRT/tables/table.h`, line 266

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### operator-=(double) {#operator-minus-assign-2}

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`ColumnRef&` **`operator-=`**(`double` `scalar`)

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Subtract `scalar` from every element, in place.

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Declared in `ClikaRT/tables/table.h`, line 268

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### operator\*=(double) {#operator-mul-assign-2}

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`ColumnRef&` **`operator*=`**(`double` `scalar`)

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Multiply every element by `scalar`, in place.

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Declared in `ClikaRT/tables/table.h`, line 270

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### operator/=(double) {#operator-div-assign-2}

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`ColumnRef&` **`operator/=`**(`double` `scalar`)

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Divide every element by `scalar`, in place.

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Declared in `ClikaRT/tables/table.h`, line 272

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### operator%=(double) {#operator-mod-assign-2}

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`ColumnRef&` **`operator%=`**(`double` `scalar`)

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Elementwise modulo by `scalar`, in place.

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Declared in `ClikaRT/tables/table.h`, line 274

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### pow(double) {#pow-2}

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`ColumnRef&` **`pow`**(`double` `exponent`)

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Raise every element to `exponent`, in place.

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Declared in `ClikaRT/tables/table.h`, line 276

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### floordiv(double) {#floordiv-2}

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`ColumnRef&` **`floordiv`**(`double` `divisor`)

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Floor-divide every element by `divisor`, in place.

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Declared in `ClikaRT/tables/table.h`, line 278

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### operator=(Tensor) {#operator-assign}

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`ColumnRef&` **`operator=`**(`const` [`Tensor`](../Tensor.md)`&` `values`)

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`frame["new"] = tensor`: create or replace this column from a 1-D tensor.

**Throws**

- `ClikaRT::Error`: on a tensor the column cannot take (non-1-D, non-numeric, or a length mismatch).

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Declared in `ClikaRT/tables/table.h`, line 302

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### operator=(ColumnRef) {#operator-assign-2}

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`ColumnRef&` **`operator=`**(`const ColumnRef&`) `=delete`

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Declared in `ClikaRT/tables/table.h`, line 303

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