assignment sign in matlab

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2.12: Assignment and Equality

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• Page ID 85946

• Allen B. Downey
• Olin College via Green Tea Press

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For beginning programmers, a common source of confusion is assignment and the use of the equals sign.

In mathematics, the equals sign means that the two sides of the equation have the same value. In MATLAB, an assignment statement looks like a mathematical equality, but it’s not.

One difference is that the sides of an assignment statement are not interchangeable. The right side can be any legal expression, but the left side has to be a variable, which is called the target of the assignment. So this is legal:

But this is not:

In this case the error message is not very helpful. The problem here is that the expression on the left side is not a valid target for an assignment.

Another difference between assignment and equality is that a mathematical equality is true (or false) for all eternity; an assignment statement is temporary. When you assign x = y + 1 , you get the current value of y . If y changes later, x does not get updated.

A third difference is that a mathematical equality is a statement that may or may not be true. In mathematics, \(y = y+1\) is a statement that happens to be false for all values of \(y\) . In MATLAB, y = y + 1 is a sensible and useful assignment statement. It reads the current value of y , adds 1, and replaces the old value with the new value.

When you read MATLAB code, you might find it helpful to pronounce the equals sign as “gets” rather than “equals.” So x = y + 1 is pronounced “ x gets the value of y plus one.”

Description

Assign a value to a workspace variable

• assignin( ws ,' var ', val )

assignin ( ws ,' var ', val ) assigns the value val to the variable var in the workspace ws . var is created if it doesn't exist. ws can have a value of 'base' or 'caller' to denote the MATLAB base workspace or the workspace of the caller function.

The assignin function is particularly useful for these tasks:

• Exporting data from a function to the MATLAB workspace
• Within a function, changing the value of a variable that is defined in the workspace of the caller function (such as a variable in the function argument list)

The MATLAB base workspace is the workspace that is seen from the MATLAB command line (when not in the debugger). The caller workspace is the workspace of the function that called the M-file. Note the base and caller workspaces are equivalent in the context of an M-file that is invoked from the MATLAB command line.

This example creates a dialog box for the image display function, prompting a user for an image name and a colormap name. The assignin function is used to export the user-entered values to the MATLAB workspace variables imfile and cmap .

• prompt = {'Enter image name:','Enter colormap name:'}; title = 'Image display - assignin example'; lines = 1; def = {'my_image','hsv'}; answer = inputdlg(prompt,title,lines,def); assignin('base','imfile',answer{1}); assignin('base','cmap',answer{2});

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Using assignin with structure elements

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Rangers' Max Scherzer throws batting practice, hopes to begin rehab assignment soon

Max Scherzer of the Texas Rangers threw 40 pitches to hitters on Tuesday and expressed hope that he can begin a rehab assignment soon

ARLINGTON, Texas — Max Scherzer of the Texas Rangers threw 40 pitches to hitters on Tuesday and expressed hope that he can begin a rehab assignment soon.

“Got to recover well from this,” Scherzer said. “Make sure my thumb is OK as I ramp back up into this. As long as I check that box, hopefully I can get out there on rehab.”

Manager Bruce Bochy, who watched the session from behind home plate, echoed the three-time Cy Young Award winner’s optimism.

“We’ll check on him tomorrow, a good chance he will start his rehab possibly,” Bochy said. “I think that’s the way it’s leaning right now.”

Pitching coach Mike Maddux watched from behind the mound, while owner Ray Davis and general manager Chris Young were among team spectators in the dugout.

Scherzer had surgery in mid-December to repair a herniated disk in his lower back. The 39-year-old right-hander pitched one rehab outing on April 24 with Triple-A Round Rock, throwing 52 pitches. He was scratched from a second start because of right thumb soreness that team doctors later identified as a nerve issue that extended to his right triceps.

“Given that I’ve been dealing with this (thumb injury) for over a year, I’ve got to see if all the new exercises are going to do something,” Scherzer said.

The Rangers acquired Scherzer from the New York Mets in a deadline trade last July after the pitcher agreed to opt in on the final year of his contract for this season at $43.3 million. New York is paying $30.83 million of that to Texas in twice-monthly installments.

After the trade, Scherzer was 4-2 with a 3.20 ERA in eight starts for Texas, the last in the regular season on Sept. 12 before being sidelined by a muscle strain in his shoulder . He returned to make two starts in the American League Championship Series, then Game 3 of the World Series before exiting after three innings because of his back.

His 3,367 career strikeouts are the most among active pitchers, and he’s second on the active list with 214 wins and 448 games started.

AP MLB: https://apnews.com/hub/mlb