How to validate a text in MatLab? - validatestring -- MatLab

How to validate a text in MatLab? 

[Ans]

validatestring

[description]

validatestring(s,validateS);

It will check validity of s against validateS.

validateS is valid when only one of validateS is started with s (the matched string is the only one)

, or all of validateS are started with S and any of validateS is the substring of others (the matched string is the shortest length one).

When validateS is valid, validatestring function will throw the matched string.

Otherwise, it will throw exception.

more details on:

Check validity of text - MATLAB validatestring (mathworks.com)

code

clear

clc

a = findArea('Rect',10,3,'cm')

fprintf("1\n");

a = findArea('octagon',7,13,'in')

fprintf("2\n");

a = findArea('TRI',10,3,'mi')

fprintf("3\n");

function a = findArea(shape,h,w,units)

expectedShapes = {'square','rectangle','triangle'};

expectedUnits = {'cm','m','in','ft','yds'};

shapeName = validatestring(shape,expectedShapes,1);

unitAbbrev = validatestring(units,expectedUnits,mfilename,'units',4);

switch shapeName

case {'square','rectangle'}

a = h*w;

case {'triangle'}

a = h*w/2;

otherwise

error('Unknown shape passing validation.')

end

end

result:

a =

30

1

Error using validatestring_example2>findArea (line 14)

Expected input number 1 to match one of these values:

'square', 'rectangle', 'triangle'

The input, 'octagon', did not match any of the valid values.

Error in validatestring_example2 (line 6)

a = findArea('octagon',7,13,'in')

explanation

In second function call

a = findArea('octagon',7,13,'in')

the validateS {'square','rectangle','triangle'} can not be matched with the s 'octagon' because

validateS are not started with 'octagon' elements-byelements.

In third function call

a = findArea('TRI',10,3,'mi')

the validateS {'cm','m','in','ft','yds'} can not be matched with s 'mi' because

validateS are not started with 'octagon' elements-byelements.