How to execute multiple commands at once

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William Campbell
William Campbell 2019-2-21
评论： Walter Roberson 2019-2-22
I think this should be fairly basic but I want to make a function where I put an input array, the function does multiple simples commands and creates an output array
For example
Somthing like
function('input','output') %changes input to output using the following commands at once to the array
output(:,1)=input(:,1)*0.72+74;
output(:,3)=input(:,3)*0.39+170;
output(:,4)=input(:,3)*0.78+57;
output(:,5)=input(:,3)*1.2+0.46;
output(:,9)=input(:,3)*1.1+26;
output(:,13)=input(:,3)*0.52+130;
output(:,14)=input(:,3)*0.63+97;
output(:,15)=input(:,3)*0.66+91;
output(output(:,9)==26,9) = 0; %changes everything that is y intercept to 0
output(output(:,5)==0.460,5) = 0; %changes everything that is y intercept to 0
Thanks!
MATLAB Version: 9.3.0.713579 (R2017b)

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回答（1 个）

Fangjun Jiang
Fangjun Jiang 2019-2-21
编辑：Fangjun Jiang 2019-2-21
You just need to change the first line to below and save it as MyCal.m.
function output=MyCal(input)
You function name would be called MyCal. You use it like
MyCal(magic(15))
type "doc function" to learn how to define function
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William Campbell
William Campbell 2019-2-21
Sorry maybe I should have explained more clearly;
I have a data set a.x which has 18 columns and 10273 rows
I want to edit the columns using the following
a.x(:,1)=a.x(:,1)*0.72+74;
a.x(:,3)=a.x(:,3)*0.39+170;
a.x(:,4)=a.x(:,3)*0.78+57;
a.x(:,5)=a.x(:,3)*1.2+0.46;
a.x(:,9)=a.x(:,3)*1.1+26;
a.x(:,13)=a.x(:,3)*0.52+130;
a.x(:,14)=a.x(:,3)*0.63+97;
a.x(:,15)=a.x(:,3)*0.66+91;
a.x(a.x(:,9)==26,9) = 0;
a.x(a.x(:,5)==0.460,5) = 0;
I have been doing this normally but doing each command seperately.
I was wondering if there was way of doing all commands at once to a.x and calling the new file b.x?
Thanks
Walter Roberson
Walter Roberson 2019-2-22
I suspect it can be coded as a matrix multiplication with a 18 x 19 matrix, starting from eye(18,19) and setting specific coefficients. However the setting of the coefficients would be a nuisance. I guess you could use sparse() to put them in in a compact form, but it would not be clear.

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