how to change this error

Problem finding getMapfileName in com.mathworks.mlwidgets.help.HelpUtils: null

if isBetween(map_r(cnt1,cnt2),min(x1_r),max(x1_r))&& isBetween(map_g(cnt1,cnt2),min(x1_g),max(x1_g))&& isBetween(map_b(cnt1,cnt2),min(x1_b),max(x2_b))
result(cnt1,cnt2,3)=1;

[Walter Roberson]

I think we will need to see more of the error message.

Is map_r a function or a java object or an array?

Is that your code or code from some Mathworks routine?

[Dhanya shree Srihari]

This code i taken form Math works ,and i am changed the source code to my own data sets.

[Walter Roberson]

Please indicate where we can find the original code

[Dhanya shree Srihari]

satellite image classification from http://str.yonsei.ac.kr/korean/files/2007144345__________________.pdf

i dont know these code correct or not just i tried it.

[Dhanya shree Srihari]

thank u so much , but one more error occured Undefined function or variable 'meanwater_r'.

Error in sc (line 10) water_r=meanwater_r; this is a full code of water %water %red water_r=meanwater_r; meanwater_r=mean(water_r); stdwater_r=std(water_r); %green meanwater_g=mean(water_g); stdwater_g=std(water_g); %blue meanwater_b=mean(water_b); stdwater_b=std(water_b); x=0:0.0001:1; %red-water w_r=normpdf(x,meanwater_r,stdwater_r); %red-forest f_r=normpdf(x,meanforest_r,stdforest_r); %red syms x y one=(exp((-(x-meanwater_r).^2)/(2*stdwater_r^2))/(stdwater_r*sqrt(2*pi))-y); two=(exp((-(x-meanforest_r).^2)/(2*stdforest_r^2))/(stdwater_r*sqrt(2*pi))-y); %water [x1_r, y1_r]=solve(one,two); x1_r=double(x1_r); y1_r=double(y1_r); %forest [x2_r, y2_r]=solve(two,three); x2_r=double(x2_r); y2_r=double(y2_r);

Answer 1

[Walter Roberson]

That code is not from Mathworks, it is from some private individual.

That code appears on page 11 of the pdf. At the top of that page, it show some commented out code that would define the function isBetween. You need to have created an isBetween.m containing that code (but not commented). Or better yet, use:

function r = isBetween(c, x, y)
  r = x <= c & c <= y;
end

Note that my improved version also fixes a bug in the original code: the original code used a strict inequality x < c < y but the context of the calling code requires x <= c <= y .

The entire double "for" loop that calculates result could then be replaced by:

result = isBetween(map_r, min(x1_r), max(x1_r)) & ...
         isBetween(map_g, min(x1_g), max(x1_g)) & ...
         isBetween(map_b, min(x1_b), max(x1_b));

Answer 2

[Dhanya shree Srihari]

Error in sc (line 10) water_r=meanwater_r;

this is a full code of water %water %red water_r=meanwater_r; meanwater_r=mean(water_r); stdwater_r=std(water_r); %green meanwater_g=mean(water_g); stdwater_g=std(water_g); %blue meanwater_b=mean(water_b); stdwater_b=std(water_b); x=0:0.0001:1; %red-water w_r=normpdf(x,meanwater_r,stdwater_r); %red-forest f_r=normpdf(x,meanforest_r,stdforest_r); %red syms x y one=(exp((-(x-meanwater_r).^2)/(2*stdwater_r^2))/(stdwater_r*sqrt(2*pi))-y); two=(exp((-(x-meanforest_r).^2)/(2*stdforest_r^2))/(stdwater_r*sqrt(2*pi))-y); %water [x1_r, y1_r]=solve(one,two); x1_r=double(x1_r); y1_r=double(y1_r); %forest [x2_r, y2_r]=solve(two,three); x2_r=double(x2_r); y2_r=double(y2_r);

[Walter Roberson]

That cannot be the full code. What you posted only has one line of code, all of which is a comment. Even if we guess at the line breaks, the line shown in the message as being in error is at most line 3, not the line 10 of the error message. This is important because I think that the error is on the lines you omitted.