extract letters in country name

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Ileana Gonzalez
Ileana Gonzalez 2018-9-30
评论： Ileana Gonzalez 2018-9-30
The file contains a 10-by-1 structure array called S. The 10 elements in S correspond to 10 different countries, whose name, GDP per capita (in USD), population and land area (in square kilometers) are stored in different structure fields. For example, S(1) leads to the output
ans =
struct with fields:
CountryName: ’China’ GDP: 8643
Population: 1.4095e+09 Area: 9326410
In one line of code, extract the first 3 letters of the name of the 4th country stored in S and save it to a string called country4. I don't know how to do this. SO i have an idea of something like S(4,1) but there where would i include the (1:3) to extract just the three letters? I just need guidance i really want to learn this no answers Thanks.

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Image Analyst
Image Analyst 2018-9-30
It's not S(4,1), it's S(4) and then you need the field name, CountryName, and it's the CountryName that takes the index 1:3. Try it. Experiment around. If you still need help with your homework, write back.

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